Physcia

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Physcia
Physcia atrostriata - Flickr - pellaea (1).jpg
Physcia millegrana
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Caliciales
Family: Physciaceae
Genus: Physcia
(Schreb.) Michaux (1803)
Type species
Physcia tenella
(Scop.) DC. (1805)
Synonyms [1]

Physcia is a genus of lichen-forming fungi in the family Physciaceae. The widely distributed genus contains about 80 species. The genus is cosmopolitan, and has been extensively studied in various regions in the past several decades, with significant biodiversity in South America identified as a central diversity hotspot. Physcia species are foliose, lobate lichens that grow with a loose to close appressed habit. Their upper surface is typically whitish, pale greenish, green-grey, or dark grey in colour. The thallus colour remains relatively unchanged when moistened. Physcia lichens typically grow on bark, on wood, or rock, although they have occasionally been recorded dwelling on man-made structures. They thrive in nutrient-rich environments and are expanding rapidly in urban areas of the United Kingdom previously affected by SO2 pollution.

Contents

The main characteristics that separate Physcia from similar genera in the same order, including Dirinaria , Heterodermia , Hyperphyscia , Kashiwadia , Phaeophyscia , and Pyxine , are the distinct morphology of its ascospores (brown and two-celled), its somewhat cylindrical pycnoconidia (asexual reproductive structures), and the presence of the chemical atranorin in the upper cortex . Physcia has been divided into sections based on morphological and chemical characters , such as the presence or absence of cilia on the thallus margins and K+ (yellow) spot test reaction in the cortex.

The genus Physcia was formally established by André Michaux in 1805, who elevated it from a section within the genus Lichen as originally outlined by Johann Christian Daniel von Schreber in 1791. Over the years, the genus has been divided into various sections based on characters such as hypothecium colour, presence of cilia , thallus spotting, and chemical reactions, with significant contributions from taxonomists like Edvard August Vainio in 1890 and Roland Moberg, who in 1977 and later in 1986, refined the infrageneric classification of this diverse genus.

Numerous lichenicolous fungi are known to colonise Physcia species include those with species epithets reflecting their ecological ties to this host, such as Bryostigma epiphyscium and Xanthoriicola physciae . Infections by these fungi can cause distinct physical symptoms useful for identification, such as the gall formations by Syzygospora physciacearum and the orange discolouration by Marchandiomyces auranticus . Additionally, the long cilia of Physcia adscendens , which confer velcro-like attachment capabilities to the thallus of this species, are used by birds in nest building. Some Physcia species have been employed in biomonitoring studies of air quality.

Systematics

Historical taxonomy

Physcia stellaris was the first of its genus to be formally described. Physcia stellaris P34 (5).JPG
Physcia stellaris was the first of its genus to be formally described.

The first member of the present-day genus Physcia to be formally described was Physcia stellaris. This was one of several dozen lichen species described by the Swedish taxonomist Carl Linnaeus in his 1753 treatise Species Plantarum . [4] The genus was originally circumscribed in 1791 by Johann Christian Daniel von Schreber as a section of the genus Lichen. André Michaux promoted the section to full genus status in 1805. [5] Although he cited the description given by Erik Acharius in his 1798 Prodromus, Acharius himself had treated the taxon as a tribus, meaning that it is not validly published according to the rules of botanical nomenclature. Because Acharius in an earlier 1794 publication cited Schreber 1791, the authorship of the basionym is attributed to him. [6] The type species of the genus was only chosen about 150 years later: in 1963, John Walter Thomson chose Physcia tenella (Scop.) DC. from the list elaborated by Michaux (1803) based on the species cited by Acharius (1798). [7] Physcia is the type genus of the Physciaceae, a family proposed by Alexander Zahlbruckner in 1898. [8]

Infrageneric classification

In 1890, Edvard August Vainio, divided the genus into two sections, Euphyscia and Dirinaria, which were characterised by having a colourless or brownish-black hypothecium, respectively. Euphyscia, in turn, was divided into Albida (K+ yellow thallus) and Sordulenta (K−), while the latter was further divided into Brachysperma and Macrosperma based on the morphology of their conidia. [9] Gustaf Einar Du Rietz used Vainio's sectional arrangement in his 1925 treatment of Scandinavian Physcia species. [10] A decade later, Lynge proposed instead a different infrageneric organisation, dividing the genus into the subgenera Macrosperma and Brachysperma, the latter of which was further subdivided into several sections. [11]

The Swedish lichenologist Roland Moberg has authored or co-authored numerous scientific publications on the taxonomy and phytogeography of Physcia and related genera. In a 1977 work, he divided Physcia into four sections: [6]

  • Distinguished by the presence of cilia along the edges of the lobes.
  • Identified by a maculated (spotted) thallus surface, lobes that are cilia-free, and both cortex and medulla reacting K+ yellow, with atranorin present along with zeorin.
  • Characterised by their narrowly ellipsoid spores featuring a unique ornamentation on their surface.
  • Noted for the absence of marginal cilia and maculation on the surface, as well as a K-negative spot test reaction in the medulla. [6]

In 1986, Moberg proposed an additional section:

  • Identified by an upper surface without maculation, a cortex and medulla that both react K+ yellow (containing atranorin and zeorin), no cilia, and a black underside. [12]

Naming

The vesiculose, or blistered, aspect of the thallus surface, seen here in Physcia aipolia, may have been the inspiration of the genus name. Physcia aipolia (Ehrh. ex Humb.) Furnr 211944.jpg
The vesiculose, or blistered, aspect of the thallus surface, seen here in Physcia aipolia , may have been the inspiration of the genus name.

The generic name Physcia is derived from the Ancient Greek Φυσκίων, physkion, meaning "bladder" or "blister". One source suggests that this name alludes to the lichen's apothecia and soredia found on its foliose thallus, which give the surface a vesiculose ("blistered") aspect when these reproductive structures develop. [13] In an alternative etymological interpretation, John Alan Elix suggests that the name was originally intended to refer to species with inflated or hollow lobes. However, he notes, the name is somewhat of a misnomer, as species like Physcia physodes (now classified as Hypogymnia physodes ) that were originally included under this term, no longer fall within the genus. [14]

Species in the genus Physcia are commonly known as "rosette lichens". [15] This common name alludes the centrifugal (rosette-like) growth form characteristic of many of the species. [16]

Species pairs

Species pairs within a genus are closely related species that are morphologically similar but can be distinguished by subtle differences, often in their chemical compositions or reproductive strategies. However, advanced molecular methods have challenged the traditional concept of species pairs within the genus Physcia, which was previously defined largely through these similarities. Molecular analyses reveal that the phylogenetic relationships among taxa like Physcia aipolia and P. caesia are more complex than previously understood. These findings indicate that distinctions based on morphological and chemical characteristics alone do not necessarily reflect the true genetic diversity and evolutionary relationships within the genus. Consequently, the concept of species pairs, which suggests a straightforward dichotomy between similar species, is considered outdated. This perspective advocates for an integrative approach to species differentiation that combines morphological, chemical, and genetic data to more accurately delineate species within Physcia. [17]

Description

Physcia tenella has soredia and cilia on the margins of its lobes. Physcia tenella 105501426.jpg
Physcia tenella has soredia and cilia on the margins of its lobes.

The thallus of Physcia is foliose, meaning it is leaf-like in structure, and lobate , typically forming a roughly circular shape with lobes radiating outward. [18] The thallus is generally loosely attached to its substrate [19] Thallus lobes are narrow, generally less than 3 mm wide, with a colouration that ranges from whitish and bluish-grey to dark grey. [18] The thallus of Physcia grows to about 8 cm (3 in) in diameter, although neighbouring thalli can combine to form more extensive growths. The upper surface colour ranges from greenish grey or whitish grey to dark grey. [14] The thallus shows minimal colour change or remains unchanged when wet. [20] The surface can be matt or slightly glossy and might display minute white spots known as pseudocyphellae (tiny pores that allow gas exchange) visible with magnification. [18] The texture of the surface varies from smooth to wrinkled ( rugose ) to pimpled ( verrucose ), as in the example of P. verrucosa . [21] Sometimes, the surface is covered with white maculae (spots). [14] The lobes may also be covered with a fine, white powdery coating ( pruina ) and can have fringe-like projections ( cilia ) along the edges. [18] Although the value of pruina as a taxonomic character is sometimes considered dubious due to possible environmental influences, a group of species has a constant, fine, and homogeneous pruinosity, mainly on the distal parts of the upper thallus surface: P. atrostriata, P. krogiae, P. phaeocarpa, P. undulata, and P. verrucosa. [21]

The underside of the thallus is typically whitish, pale tan, grey, or pinkish. [18] In contrast, the lower surface of Physcia atrostriata is distinctively prosoplectenchymatous , featuring a brown-black colour with striations, which sets it apart from other species in the genus. [20] The thallus underside has rhizines, which are root-like structures that can be simple or branched. [18] They range in colour from white to brownish-black. [14] Many species within this genus develop soralia, structures that produce powdery reproductive propagules, on their upper surface. [18] Physcia species can be distinguished and grouped into distinct taxa based on the position and shape of their soralia, which provides valuable characteristics for identification and classification. [20]

The upper cortex —the protective outer layer of the thallus—is paraplectenchymatous , meaning it consists of tightly packed, roughly equal-sized cells. The lower cortex, in most instances, is prosoplectenchymatous —a tissue arrangement in which constituent fungal hyphae are aligned in a particular direction. The lower cortical layer is a layer that is usually 6–8 cells thick (about 20–30 μm) arranged in a periclinal fashion. Less frequently, Physcia species have been reported to have an anomalous "paraplectenchymatous" lower cortex. Two groups of these occur: those with a pale lower cortex (such as P. albata and P. halei); and those with a black lower cortex (such as P. crispa and P. sorediosa). Following detailed examination of various Physcia species through electron microscopy, Mason Hale discerned that the atypical lower cortex comprises two distinct layers. The basal layer is paraplectenchymatous, consisting of two to three cells in thickness, while the upper layer is prosoplectenchymatous and varies in thickness, occasionally blending seamlessly into the medulla. [22] The photosynthetic partner in the lichen is trebouxioid —a type of green algae. [18]

Reproductive structures (apothecia) are common; these are lecanorine in form, meaning they are disc-like and surrounded by a pale thalline margin . [20] They can be directly attached to the thallus or borne on short stalks, without rhizines beneath them. The discs of these structures are typically brown to black, often with a white pruina, surrounded by a thalline margin . The tissue layers within, namely the hymenium and hypothecium , are colourless. The structural support within the hymenium consists of paraphyses, which are slender and may branch at their tips which are pale brown with a darker cap. [18]

The reproductive spores , produced in structures called asci, are cylindrical to club-shaped, typically containing eight spores each. These spores are brown and have a single cross-wall (1-septate), enclosed by a thick wall. Another reproductive feature, conidiomata, are immersed structures that release asexual spores; these are visible as black dots on the surface of the lobes. The conidioma (asexual spores) are rod-shaped, colourless, and lack internal divisions (aseptate); [18] they are 4–6  μm long. [20] They are of the Physcia-type (having cells with thickened walls mainly at the ends and central septum, whose united lumina resemble a flask) or Pachysporaria-type (having rounded cells and thickened walls). [23] Ascospore size is a relatively minor factor in distinguishing between Physcia species. [20]

Chemistry

Chemically, Physcia lichens often contain atranorin in their cortex, along with zeorin and other terpenoids. [18] Several hopanoids (i.e., having the same core chemical structure as the compound hopane) have been identified from Physcia aipolia . [24]

The chemical profile of Physcia mediterranea , a rare Mediterranean species, has been studied with advanced phytochemical techniques, revealing a complex mixture of bioactive compounds, including the discovery of a kaurene-skeleton diterpene, previously undetected in lichens. Additionally, analyses identified methylbenzoic acids like sparassol and atraric acid, along with a variety of aliphatic fatty acids, phenolic compounds, and depsides such as atranol and chloroatranol. Atranol, a depside known for its high biological activity, was prominently found in the wax fraction of the extracts. The presence of sesquiterpene lactones, diphenyl ethers, and triterpenes like muronic and ursolic acids further adds to its chemical diversity. [25]

Comparison with similar genera

Phaeophyscia hirsuta 23616722.jpg
Dirinaria confluens (Fr.) D.D. Awasthi 812561.jpg
Phaeophyscia hirsuta (left) and Dirinaria confluens are two of many examples of species previously classified in Physcia. [26] [27]

Physcia distinguishes itself from similar genera such as Dirinaria , Heterodermia , Hyperphyscia , Phaeophyscia , and Pyxine through several distinctive features. Both the upper and lower cortex of Physcia are paraplectenchymatous, which is similar to most of the compared genera except Heterodermia, where the lower cortex is prosoplectenchymatous when present. A reliable characteristic of Physcia is the consistent presence of atranorin in the upper cortex, unlike Hyperphyscia where it is rarely present, and Phaeophyscia where it is absent. [28]

The medulla in Physcia is typically white, akin to Hyperphyscia and Phaeophyscia, but can also be pigmented, which aligns more closely with Dirinaria and Pyxine. Pruina, or a powdery coating, is variably present or absent in Physcia, providing a surface feature that can aid in distinguishing it from Hyperphyscia where pruina is rare and Dirinaria where it is consistently absent.

In terms of reproductive structures, the apothecial algal layer in Physcia persists, similar to other compared genera except for Pyxine, where it is not persistent. The epithecium in Physcia reacts negatively to potassium hydroxide (K–), which is a common trait across all compared genera except for Pyxine, where it turns violet (K+ violet). The hypothesised colour of the hypothecium in Physcia ranges from colourless to yellowish, unlike the dark brown hypothesised seen in Dirinaria and Pyxine.

The ascosporic type and conidial morphology further support the unique positioning of Physcia among its peers. The ascosporic type mirrors that of Phaeophyscia, [28] both of which differ significantly from the types found in Dirinaria and Pyxine. Conidial shapes in Physcia are bacilliform (rod-shaped) to bifusiform (elongated and tapering at both ends, with a narrow middle) or somewhat lageniform (flask-shaped), with sizes ranging from 4–6 μm, which provides a subtle but important distinction from the generally shorter conidia of Pyxine and the longer, filamentous conidia of Hyperphyscia.

The genus Kashiwadia is distinguished from Physcia by several key features: it has significantly narrower thalline lobes and both its upper and lower cortical layers are paraplectenchymatous. Additionally, Kashiwadia bears a closer phylogenetic resemblance to the members of the Heterodermia branch within the Physciaceae. [29]

Habitat and distribution

Species of the genus Physcia grow on bark, wood, and rock, often in environments rich in nutrients or those that have been enriched by human activity. In the UK, several species have rapidly adapted to urban areas that were once heavily polluted by SO2. [30] Similarly, Physcia tenella, a nitrophilous lichen, is reestablishing itself in its former habitats around Toruń, Poland, due to improvements in air quality resulting from reduced industrial emissions. [31]

The genus has a widespread, cosmopolitan distribution. [30] Several floristic works have investigated the occurrence of Physcia in specific regions. For example, Moberg identified 21 species in East Africa in 1986, [12] while Swinscow and Krog reported 21 species in their 1988 study on East African lichens. [32] Aptroot included 5 species in his 1987 work on the flora of Guyana, French Guiana, and Suriname. [33] Moberg's 1990 study found 34 species in Central and South America, suggesting that the continent may be the centre of diversity for the genus. [34]

In the Sonoran Desert and adjacent areas, Moberg discovered 25 species. [35] [36] As of 2023, 42 species have been recorded in North America. [37]

Moberg reported 17 species in Australia in 2001, [38] while Galloway and Moberg recognized 14 species in New Zealand in 2005. [20] Elix recorded 31 species in 2009. [14] Harada identified eight species in Japan in 2016. [39] In 2007, Awasthi reported 18 species in the South Asian region encompassing India, Nepal, and Sri Lanka. [19]

Species interactions

Illosporiopsis christiansenii 251711800.jpg
Illosporiopsis christiansenii
Marchandiomyces aurantiacus on Physcia adscendens (39108576594).jpg
Erythricium aurantiacum

Numerous species of lichenicolous fungi are known to colonise Physcia species, and several of these fungi have species epithets that incorporate the host genus name, reflecting their specific ecological associations. These include: Bryostigma epiphyscium , Xanthoriicola physciae , Zwackhiomyces physciicola , Microsphaeropsis physciae , Didymocyrtis physciae , Lichenopeltella physciae , Nectriopsis physciicola , Lichenochora physciicola , Feltgeniomyces physciae , and Trichoconis physciicola . [40] Josef Hafellner and Erich Zimmermann published a key to the lichenicolous fungi that invade Physcia species in a 2012 publication, in which they included 39 species. [41]

Some infections by lichenicolous fungi result in characteristic physical symptoms that aid in identification. For example, infection by Syzygospora physciacearum results in the formations of galls, whereas others can be recognised by their discolouration: Marchandiomyces auranticus is orange, Illosporiopsis christiansenii is pink, while parasitism by Bryostigma epiphyscium creates tiny black spots. [30]

The species Physcia adscendens is characterised by its long cilia , which have been observed to function akin to cladding on the exteriors of bird nests. These structures enhance the lichen's ability to adhere to surfaces, providing a velcro-like property that facilitates attachment. [42]

Species

Historically, many taxa have been assigned the generic name Physcia; Index Fungorum has records for more than 2000 taxa that have been assigned to that genus. Recent estimates of the number of species in the genus include about 50 (2001); [43] 73 species (2008), [44] and about 80 (2016 [45] and 2022 [46] ). As of April 2024, Species Fungorum (in the Catalogue of Life) accept 42 species of Physcia. [47]

Physcia erumpens Physcia erumpens - Flickr - pellaea.jpg
Physcia erumpens
Physcia leptalea Physcia leptalea 1.jpg
Physcia leptalea
Physcia millegrana Physcia millegrana 140676.jpg
Physcia millegrana
Physcia tribacia Physcia tribacia - Flickr - pellaea (1).jpg
Physcia tribacia
Physcia undulata Physcia undulata - Flickr - pellaea (1).jpg
Physcia undulata

Biomonitoring

The genus Physcia, including specific species such as Physcia adscendens , serves as a highly sensitive bioindicator for nitrogen pollution, which is a critical and escalating issue in tropical regions where bioindicator development is challenged by gaps in taxonomic and ecological knowledge. Utilising characteristics derived from studies in Europe and North America, traits and taxonomy of Physcia species can be effectively adapted for monitoring nitrogen levels in tropical ecosystems, thereby supporting environmental management and conservation initiatives. [110]

Sigal and Nash established a classification system based on the sensitivity of over 20 lichen species to air pollutants, noting that highly pollution-tolerant species such as Physcia biziana and Physcia tenella were frequently observed in the Los Angeles area without any morphological changes, despite significant environmental degradation. In contrast, very sensitive species had vanished from the region, and others like Usnea spp. were found only in minimal amounts, indicating a marked decline since the turn of the century. [111]

In one study on air quality monitoring in the tropics, Physcia was identified as prevalent in urban environments with poor air quality, particularly high levels of nitrogen dioxide (NO2) and sulfur dioxide (SO2). This prevalence is attributed to its tolerance to pollution, where unlike more sensitive species, Physcia does not die off but thrives, thereby serving as a reliable bioindicator for monitoring long-term air quality in urban settings. This capability highlights its potential for inclusion in air quality assessment frameworks, especially beneficial in regions with limited air quality monitoring infrastructure. [112]

In laboratory experiments, Physcia tribacia has shown the ability to clean water by removing antimony trioxide, a toxic substance. [113] This process is most efficient under specific conditions and naturally occurs in a way that spontaneously releases heat, suggesting it could be a cost-effective and eco-friendly option for or the removal of metal pollution. [114]

Related Research Articles

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<span class="mw-page-title-main">Physciaceae</span> Family of lichen-forming fungi

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<i>Ramalina</i> Genus of lichen-forming fungi

Ramalina is a genus of greenish fruticose lichens that grow in the form of flattened, strap-like branches. Members of the genus are commonly called strap lichens or cartilage lichens. Apothecia are lecanorine.

<i>Heterodermia</i> Genus of lichen

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<i>Pyxine</i> Genus of lichens

Pyxine is a genus of foliose lichens in the family Caliciaceae. The genus has a widespread distribution in tropical regions.

<i>Physciella</i> Genus of lichens

Physciella is a genus of lichen-forming fungi in the family Physciaceae. Circumscribed by the lichenologist Ted Esslinger in 1986, it is distinguished from the similar genera Physcia and Phaeophyscia by its prosoplectenchymatous lower cortex, the lack of the secondary metabolite atranorin in the upper cortex, and short, ellipsoid-shaped conidia.

<i>Phaeophyscia</i> Genus of lichens

Phaeophyscia is a genus of lichen-forming fungi in the family Physciaceae.

<i>Flavoparmelia</i> Genus of fungi

Flavoparmelia is a genus of foliose lichens in the family Parmeliaceae. Because of their appearance, they are commonly known as greenshield lichens. The widely distributed genus contains 32 species. It was circumscribed by American lichenologist Mason Hale in 1986 to contain 17 former Pseudoparmelia species with broad lobes, usnic acid in the cortex, and isolichenan in the cell walls.

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<span class="mw-page-title-main">Caliciaceae</span> Family of lichen-forming fungi

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<i>Physcia caesia</i> Blue-gray foliose lichen found throughout much of the world

Physcia caesia, known colloquially as blue-gray rosette lichen and powder-back lichen, is a species of foliose lichenized fungus. First described by Georg Franz Hoffmann in 1784, it is common across much of Europe, North America and New Zealand, and more patchily distributed in South America, Asia, Australia and Antarctica. There are 2 subspecies: P. c. caesia and P. c. ventosa, as well as a number of distinct forms and varieties. Molecular studies suggest that the species as currently defined may be polyphyletic. It is typically pale gray shading to darker gray in the center, and grows in a small rosette, usually some 2–3 cm (0.79–1.18 in) across at maturity. It only rarely has apothecia, instead reproducing most often vegetatively via soredia, which are piled in round blue-gray mounds across the thallus's upper surface. It grows most often on rock—principally calcareous, but also basaltic and siliceous—and also occurs on bone, bark and soil. It is nitrophilic and is particularly common on substrates where birds perch.

<i>Pyxine sorediata</i> Species of lichen

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<i>Pyxine subcinerea</i> Species of lichen

Pyxine subcinerea is a species of foliose lichen in the family Caliciaceae. It has a pantropical distribution, and typically grows on bark, but less commonly on rocks. The lichen is characterised by its yellow medulla, soralia on the margins on the lobes that make up the thallus, and the presence of the chemical lichexanthone in the cortex.

<i>Physcia aipolia</i> Species of lichen

Physcia aipolia, commonly known as the Hoary rosette lichen, is a lichen species of fungus in the genus Physcia, and family Lecanoromycetes. Physcia aipolia is a species of lichen in the family Physciaceae. It has a worldwide distribution.Physcia aipolia is a known host species to the lichenicolous fungus species Muellerella lichenicola. It is characterized by the pale blue to gray thallus with many apothecia. Physcia aipolia is a common, widely distributed species, and can be found growing on a variety of trees and branches.

<i>Kurokawia palmulata</i> Species of lichen

Kurokawia palmulata, the shaggy fringe lichen, is a species of corticolous (bark-dwelling), foliose lichen in the family Physciaceae.

<i>Dirinaria confluens</i> Species of fungus

Dirinaria confluens is a species of foliose lichen belonging to the genus Dirinaria within the family Caliciaceae. It was originally described by D.D.Awasthi in 1975.

<i>Dirinaria picta</i> Species of fungus

Dirinaria picta is a species of lichen within the family Caliciaceae, classified under the order Caliciales in the class Lecanoromycetes of the division Ascomycota.

<i>Physcia magnussonii</i> Species of lichen

Physcia magnussonii is a species of saxicolous (rock-dwelling), foliose lichen in the family Physciaceae. It was formally described as a new species in 1952 by the Swiss botanist Eduard Frey. He collected the type specimen in Bern, Switzerland. The species epithet honours the Swedish lichenologist Adolf Hugo Magnusson. Frey's original specimen was later declared the lectotype of the species by Roland Moberg in a 1977 monograph on the genus Physcia.

References

Citations

  1. ↑ "Physcia (Schreb.) Michx. 1803". MycoBank. International Mycological Association. Retrieved 12 December 2011.
  2. ↑ von Schreber, Jo. Christiano Dan (1791). Genera Plantarum (in Latin). Vol. 2 (8th ed.). Frankfurt am Main: Varrentrapp and Wenner˜. p. 768.
  3. ↑ Ciferri, R.; Tomaselli, R. (1953). "Saggio di una sistematica micolichenologica" [Essay on a mycolichenological systematics]. Atti dell'Istituto Botanico della Università e Laboratorio Crittogamico di Pavia. 5 (in Italian). 10 (1): 25–84.
  4. ↑ Jørgensen, Per M.; James, Peter W.; Jarvis, Charles E. (1994). "Linnaean lichen names and their typification". Botanical Journal of the Linnean Society. 115 (4): 261–405. doi:10.1111/j.1095-8339.1994.tb01784.x.
  5. ↑ Michaux, A. (1803). Flora Boreali-Americana [Flora of North America]. Vol. 2. Paris/Strasbourg: Levrault Brothers. p. 326. ISBN   978-0-665-47757-7.
  6. 1 2 3 Moberg, Roland (1977). The lichen genus Physcia and allied genera in Fennoscandia. Symbolae Botanicae Upsalienses. Vol. 22. Uppsala: Acta Universitatis Upsaliensis. pp. 1–108. ISBN   91-554-0648-3.
  7. 1 2 3 4 Thomson, John W. (1963). "The lichen genus Physcia in North America". Beihefte zur Nova Hedwigia. 7. Weinheim: J. Cramer: 57. ISBN   978-3-7682-5407-6.
  8. ↑ Engler, A. (1898). Syllabus der Pflanzenfamilien [Syllabus of Plant Families] (in German). Gebrüder Borntraeger. p. 46.
  9. ↑ Vainio, E.A. (1890). "Étude sur la classification naturelle et la morphologie des lichens da Brésil". Acta Societatis Pro Fauna et Flora Fennica (in Latin). 7: 1–247.
  10. ↑ Du Rietz, G.E. (1925). "Lichenologiska fragment. VII" [Lichenological fragments. VII]. Svensk Botanisk Tidskrift. 19: 70–83.
  11. ↑ Lynge, B. (1913). Physciaceae. Rabenhorst's Kryptogamen-Flora von Deutschland Österreich and der Schweiz. Vol. 6 (2 ed.). pp. 41–188.
  12. 1 2 3 4 5 6 7 Moberg, R. (1986). "The genus Physcia in East Africa". Nordic Journal of Botany. 6 (6): 843–864. doi:10.1111/j.1756-1051.1986.tb00488.x.
  13. ↑ Ulloa, Miguel; Aguirre-Acosta, Elvira (2020). Illustrated Generic Names of Fungi. APS press. p. 290. ISBN   978-0-89054-618-5.
  14. 1 2 3 4 5 J.A.Elix, Physcia, Australian Physciaceae (Lichenised Ascomycota). http://www.anbg.gov.au/abrs/lichenlist/Physcia.pdf (2011).
  15. ↑ Brodo, Sharnoff & Sharnoff 2001, p. 546.
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