Pyxine cocoes

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Pyxine cocoes
Pyxine cocoes 132328.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Caliciales
Family: Caliciaceae
Genus: Pyxine
Species:
P. cocoes
Binomial name
Pyxine cocoes
(Sw.) Nyl. (1857)
Synonyms [1]
  • Lichen cocoësSw. (1788)
  • Lobaria cocoës(Sw.) Raeusch. (1797)
  • Lecidea cocoës(Sw.) Ach. (1803)
  • Circinaria cocoes(Sw.) Fée (1825)
  • Coccocarpia pellita var. cocoës(Sw.) Zahlbr. (1925)

Pyxine cocoes, the buttoned rosette lichen, [2] is a widely distributed species of foliose lichen in the family Caliciaceae.

Contents

Taxonomy

It was first described as a new species by Swedish botanist Olof Swartz in 1788. He called it Lichen cocoës, [3] following the lead of Carl Linnaeus who, in his influential 1753 work Species Plantarum , placed all lichens in the eponymous genus Lichen. Finnish lichenologist William Nylander transferred it to the genus Pyxine in 1853. [4] A common name used in North America is the "buttoned rosette lichen". [2]

Description

Pyxine cocoes has a pale grayish-green thallus comprising radiating lobes that are typically less than 1 mm wide. These lobes are closely attached to the surface of the substrate, have granular soredia that protrude through the cortex in irregularly shaped regions called soralia. The medulla is white, while the apothecia are black with black margins in mature specimens. [2] They are 1–5 mm wide, flat, and disc-shaped. [5] The tissue making up the base of the apothecia is brownish red. [2] Ascospores measure 15–22 by 6–8  μm. [5] The lichen contains lichexanthone, a xanthone compound that is found in about 20 Pyxine species. [6]

Habitat and distribution

Pyxine cocoes grows on bark and rocks. [5] The lichen has been reported from Asia (Japan and the Philippines), East Africa, North America, Central America, and South America, Hawaii, and Australia. In Australia, it is present only in coastal locations that are seasonally humid, and both wet and warm. In this continent, it is common on tree trunks growing on coral cays; these trunks are often used as bird perches, which accumulate bird droppings. The lichenologist Roderick W. Rogers suggests that the lichen could be nitrophilic, which would explain this growth habitat, as well as its tendency to prefer habitats that are at least partially urbanized. [5] In North America, it distribution extends as far north to Florida in the United States. [2]

The African species Pyxine katendei is somewhat similar in appearance to Pyxine cocoes, but it has only laminal (not marginal) soralia. [5]

Biomonitoring studies

Studies conducted in India suggest that Pyxine cocoes is a candidate for biomonitoring of local air pollution. [7] It bioaccumulates toxic heavy metals that it acquires from the air and retains the pollutants in the thallus, which can then be sampled and assayed to determine their concentration. [8] [9] [10]

Human uses

Pyxine cocoes is used in Papua New Guinea as a component of a traditional medicine-based remedy for inflammatory conditions. In a chemical analysis of the lichen, the triterpene compound 6,22-hopanediol was identified. [11] This compound, commonly known as zeorin, is a hopanoid with potent inhibitory activity against the enzyme protein tyrosine phosphatase. [12]

Related Research Articles

<i>Parmelia</i> (fungus) Genus of lichens

Parmelia is a genus of medium to large foliose (leafy) lichens. It has a global distribution, extending from the Arctic to the Antarctic continent but concentrated in temperate regions. There are about 40 species in Parmelia. In recent decades, the once large genus Parmelia has been divided into a number of smaller genera according to thallus morphology and phylogenetic relatedness.

<i>Phyllopsora</i> Genus of lichens

Phyllopsora is a genus of lichen-forming fungi in the family Ramalinaceae. It was circumscribed by Swiss botanist Johannes Müller Argoviensis in 1894, with Phyllopsora breviuscula assigned as the type species.

<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>Physcia</i> Genus of lichens

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.

<i>Myelochroa</i> Genus of lichens

Myelochroa is a genus of foliose lichens in the family Parmeliaceae. They are commonly known as axil-bristle lichens. It was created in 1987 to contain species formerly placed in genus Parmelina that had a yellow-orange medulla due to the presence of secalonic acids. Characteristics of the genus include tightly attached thalli with narrow lobes, cilia on the axils, and a rhizinate black lower surface. Chemical characteristics are the production of zeorin and related triterpenoids in the medulla. Myelochroa contains about 30 species, most of which grow on bark. The genus has centres of distribution in Asia and North America.

<i>Lepraria</i> Genus of lichens

Lepraria is a genus of leprose crustose lichens that grows on its substrate like patches of granular, caked up, mealy dust grains. Members of the genus are commonly called dust lichens. The main vegetative body (thallus) is made of patches of soredia. There are no known mechanisms for sexual reproduction, yet members of the genus continue to speciate. Some species can form marginal lobes and appear squamulose. Because of the morphological simplicity of the thallus and the absence of sexual structures, the composition of lichen products are important characters to distinguish between similar species in Lepraria.

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

The Caliciaceae are a family of mostly lichen-forming fungi belonging to the class Lecanoromycetes in the division Ascomycota. Although the family has had its classification changed several times throughout its taxonomic history, the use of modern molecular phylogenetic methods have helped to establish its current placement in the order Caliciales. Caliciaceae contains 39 genera and about 670 species. The largest genus is Buellia, with around 300 species; there are more than a dozen genera that contain only a single species.

<span class="mw-page-title-main">Dalip Kumar Upreti</span> Indian lichenologist

Dalip Kumar Upreti is an Indian lichenologist. He served as Director and Chief Scientist at CSIR-National Botanical Research Institute, Lucknow during 1988 to 2017. Also he served as Head of Lichenology and herbarium division. Presently he is serving as CSIR-Emeritus Scientist in the same division.

<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

Pyxine sorediata, commonly known as mustard lichen, is a widely distributed species of foliose lichen in the family Caliciaceae. It has a subtropical to warm temperate distribution, and grows on bark, rocks, and moss as substrates. Pyxine sorediata has been reported from regions of North America, Europe, Africa, Asia, and Australasia.

<i>Melanohalea subolivacea</i> Species of lichen in the family Parmeliaceae

Melanohalea subolivacea, commonly known as the brown-eyed camouflage lichen, is a species of foliose lichen in the family Parmeliaceae.

<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>Punctelia hypoleucites</i> Species of foliose lichen

Punctelia hypoleucites, commonly known as the southwestern speckled shield lichen, is a species of foliose (leafy) lichen in the family Parmeliaceae. First formally described by Finnish botanist William Nylander as a species of Parmelia, it was transferred to the genus Punctelia in 1982. The lichen is found in Africa, North America, and South America, where it grows on the bark of both hardwood and coniferous trees. Its greenish-grey thallus is covered with tiny white pseudocyphellae – minute holes in the thallus surface that facilitate gas exchange. Some macroscopic features that help distinguish this species from other related members of the genus include the presence and the structure of the apothecia, the absence of asexual surface propagules, and the light brown color of the thallus undersurface. Chemically, the presence of lecanoric acid in the medulla and atranorin in the cortex help distinguish it from lookalikes.

<i>Parmelia fraudans</i> Species of lichen

Parmelia fraudans is a species of foliose lichen in the family Parmeliaceae. It is found in Europe and North America, where it grows on rocks.

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

Pyxine albovirens is a species of foliose lichen in the family Caliciaceae that is found in North America and South America. It was first formally described as a species of Lecidea in 1818 by German botanist Georg Friedrich Wilhelm Meyer. André Aptroot transferred it to the genus Pyxine in 1987.

Pyxine pustulata is a species of corticolous (bark-dwelling), foliose lichen in the family Caliciaceae. Found in Botucatu, Brazil, it was formally described as a new species in 2014 by lichenologists André Aptroot and Patrícia Jungbluth. The type specimen was collected by the authors from the botanical garden on the campus of Botucatu at an altitude of 850 m (2,790 ft).

Pyxine katendei is a species of corticolous (rock-dwelling), foliose lichen in the family Caliciaceae. Found in East Africa, it was scientifically described as a new species in 1975 by lichenologists Dougal Swinscow and Hildur Krog. The lichen has a whitish to pale grey thallus that is tightly appressed to its substrate. The lobes comprising the thallus are somewhat convex; they lack pseudocyphellae, and have sparse pruina. The thallus underside is black; the internal medulla is white. The lichen contains triterpenoid compounds as well as lichexanthone; the latter substance causes the lichen to fluoresce when lit with a long-wavelength UV light.

Teuvoahtiana is a genus of lichen-forming fungi in the family Teloschistaceae. It contains three species of saxicolous (rock-dwelling), crustose lichens, all of which occur in South America.

Caloplaca cupulifera is a widely distributed species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. It has a chrome-yellow thallus with bright yellow cup-shaped soredia. Although originally described as a new species in 1915 and placed in the large genus Caloplaca in 1931, modern molecular phylogenetics suggests that its classification requires an update.

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

Pyxine petricola is a species of saxicolous (rock-dwelling), foliose lichen in the family Caliciaceae. The distribution of the lichen includes Australia, East Africa, North and Central America, and the Philippines.

References

  1. "Synonymy: Pyxine cocoes (Sw.) Nyl. [as 'cocoës']". Species Fungorum . Retrieved 17 February 2021.
  2. 1 2 3 4 5 Brodo, Irwin M.; Sharnoff, Sylvia Duran; Sharnoff, Stephen (2001). Lichens of North America. Yale University Press. p. 616. ISBN   978-0300082494.
  3. Swartz, O.P. (1788). Nova genera et species Plantarum seu prodromus descriptioneum vegetabilium maximam parte incognitorum qua sub itinere in Indiam Occidentalem annis 1783-1787 digessit Olof Swartz M.D. (in Latin). Stockholm: Acad. M. Swederi. p. 146.
  4. Nylander, W. (1857). "Enumération générale de lichens, avec l'indication sommaire de leur distribution géographique". Mémoires de la Société Impériale des Sciences Naturelles de Cherbourg (in French). 5: 85–146.
  5. 1 2 3 4 5 Rogers, R.W. (1986). "The genus Pyxine (Physciaceae, Lichenized Ascomycetes) in Australia". Australian Journal of Botany. 34 (2): 131–154. doi:10.1071/BT9860131.
  6. Aptroot, André; Jungbluth, Patrícia; Cáceres, Marcela E.S. (2014). "A world key to the species of Pyxine with lichexanthone, with a new species from Brazil". The Lichenologist. 46 (5): 669–672. doi:10.1017/s0024282914000231.
  7. Bajpai, Rajesh; Upreti, Dalip K.; Nayaka, S.; Kumari, B. (2010). "Biodiversity, bioaccumulation and physiological changes in lichens growing in the vicinity of coal-based thermal power plant of Raebareli district, north India". Journal of Hazardous Materials. 174 (1–3): 429–436. doi:10.1016/j.jhazmat.2009.09.071. PMID   19818555.
  8. Bajpai, Rajesh; Upreti, D.K. (2012). "Accumulation and toxic effect of arsenic and other heavy metals in a contaminated area of West Bengal, India, in the lichen Pyxine cocoes (Sw.) Nyl". Ecotoxicology and Environmental Safety. 83: 63–70. doi:10.1016/j.ecoenv.2012.06.001. PMID   22762786.
  9. Daimari, Rebecca; Bhuyan, Pranamika; Hussain, Sharfaa; Nayaka, Sanjeeva; Mazumder, M. A. Jafar; Hoque, Raza Rafiqul (2019). "Biomonitoring by epiphytic lichen species—Pyxine cocoes (Sw.) Nyl.: understanding characteristics of trace metal in ambient air of different landuses in mid-Brahmaputra Valley". Environmental Monitoring and Assessment. 192 (1): 37. doi:10.1007/s10661-019-8007-x. PMID   31828442.
  10. Singh, Pramod Kumar; Bujarbarua, P.; Singh, K.P.; Tandon, P.K. (2019). "Report on the bioaccumulation of heavy metals by foliose lichen (Pyxine cocoes) from air polluted area near Nagaon Paper Mill in Marigaon, Assam, North-East India". Journal on New Biological Reports. 8 (1): 15–21. ISSN   2319-1104.
  11. Noro, Jeffrey C.; Barrows, Louis L.; Rai, Prem; Ireland, Chris M.; Matainaho, Teatulohi; Bugni, Tim (2008). "Isolation of 6, 22-hopanediol from Pyxine cocoes, lichen used as traditional medicine in Papua New Guinea". Pacific Journal of Medical Sciences. 5: 90–95. ISSN   2072-1625.
  12. Thadhani, Vinitha M.; Karunaratne, Veranja (2017). "Potential of lichen compounds as antidiabetic agents with antioxidative properties: a review". Oxidative Medicine and Cellular Longevity. 2017: 1–10. doi: 10.1155/2017/2079697 . PMC   5405387 . PMID   28491237.