Hypogymnia

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Hypogymnia
Hypogymnia physodes.jpeg
Hypogymnia physodes
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Lecanorales
Family: Parmeliaceae
Genus: Hypogymnia
(Nyl.) Nyl. (1896)
Type species
Hypogymnia physodes
(L.) Nyl. (1896)
Synonyms
  • Parmelia subgen. HypogymniaNyl. (1881)
  • Cavernularia Degel. (1937)
  • Ceratophyllum M.Choisy (1951)

Hypogymnia is a genus of foliose lichens in the family Parmeliaceae. They are commonly known as tube lichens, bone lichens, or pillow lichens. Most species lack rhizines (root-like attachment organs on the lower surface) that are otherwise common in members of the Parmeliaceae, and have swollen lobes that are usually hollow. Other common characteristics are relatively small spores and the presence of physodic acid and related lichen products. The lichens usually grow on the bark and wood of coniferous trees.

Contents

Hypogymnia was proposed by lichenologist William Nylander, first as a subgenus of Parmelia in 1881, and 15 years later as a distinct genus of two species, including the widespread and common type species, Hypogymnia physodes . It has since grown to about 90 recognized species. Hypogymnia has a centre of biodiversity in China, where many of its species are found.

Taxonomy

Hypogymnia was first created as subgenus of Parmelia by Finnish lichenologist William Nylander in 1881. He associated it with the species Parmelia physodem (which ultimately became the type species, Hypogymnia physodes ), noting the lack of rhizines as the characteristic distinguishing it from Parmelia. [1] Nylander later promoted it to generic status in 1896. At this time, the genus contained only two species: Hypogymnia pertusa (currently named Menegazzia terebrata ) [2] as well as the type species. [3] For many decades afterwards, the genus did not have widespread recognition, as most lichenologists preferred to include the "hypogymnioid" lichens in the classic form genus Parmelia. [4] In 1951 Hildur Krog considered the morphology and chemistry of this group of species to be distinctive and reinstated the genus Hypogymnia. Krog included four subgenera, including H. subg. Cavernularia and H. subg.Everniiformes. [5] These later became accepted as distinct genera (the former only temporarily; see synonymy below), the latter under the name Pseudevernia . [4]

In 1974, Krog published an account of three Northern Hemisphere Hypogymnia species that grow on acid rock in arctic and alpine habitats. These species, namely H.  atrofusca, H. intestiniformis, and H. oroarctica, make up the H. intestiniformis group. [6] This biologically discontinuous assemblage of species was segregated from Hypogymnia by Trevor Goward under the genus name Brodoa in 1986. It differs from Hypogymnia in its compact medulla, larger spores and different cortical structure. [4]

Hypogymnia is classified in the Parmeliaceae. The family Hypogymniaceae has been proposed in the past to contain the genus and other similar hypogymnioid lichens, [7] but this taxonomic arrangement has not been widely accepted by other taxonomists. [8] For example, Krog argued that no critical characters had been suggested that could be used as a defining familial characteristic. [9] In the Parmeliaceae, Hypogymnia belongs to the hypogymnioid clade along with the genera Arctoparmelia , Brodoa , and Pseudevernia . [10] All of these genera share the common characteristic of having a loosely compact medulla. [11]

Hypogymnia lichens are commonly known as "tube lichens", "bone lichens", or "pillow lichens". [12] The name Hypogymnia, derived from the Ancient Greek ὑπο- (hupó, meaning "under") and γυμνός (gumnós, meaning "naked"), refers to the bare lower surface of the thallus. [13]

Synonymy

Synonyms of Hypogymnia are Cavernularia, created by Gunnar Degelius in 1937, [14] and Ceratophyllum, created by Maurice Choisy in 1951. Cavernularia contained two hypogymnoid species, C. lophyrea and C. hultenii. This species pair has an array of pronounced but small depressions in the lower surface, instead of the smooth or irregularly wrinkled surface typical of Hypogymnia; [15] Degelius called these minute cavities (about 0.1 mm diameter) "cavernulae". [14] The two Cavernularia species are otherwise similar to Hypogymnia in terms of overall morphology, microstructure of the apothecia, and chemistry. Molecular analysis showed that Cavernularia needed to be subsumed into Hypogymnia in order for the latter genus to be monophyletic. This suggested synonymy had already been proposed several decades earlier by Veli Räsänen in 1943 and Hildur Krog in 1952, but not adopted by later authors, including Krog herself. [15]

Description

Closeup of a perforated lobe tip of H. occidentalis Perforated Tips (3559699003).jpg
Closeup of a perforated lobe tip of H. occidentalis

Hypogymnia is a genus of medium to large foliose lichens. They are typically greenish grey to brownish grey in colour; [12] some species are yellowish (from usnic acid). [8] The thallus comprises more or less inflated but hollow (tube-like) lobes. These lobes often have a perforation at the tip. The colour of the ceiling of the tubes (the medullary surface) is dark brown or white, and is often used as a characteristic to distinguish between species. The lower surface of the tube is black with a smooth or wrinkled texture. [12]

Soralia at the lobe tip of H. physodes; here the tip curls up and back Hypogymnia physodes lippensorale.jpg
Soralia at the lobe tip of H. physodes; here the tip curls up and back

Rhizines are root-like attachment organs on the lower surface of a lichen thallus, made of elongated strands of hyphae; a shorter version of this attachment organ is called a hapter. Although many recent lichen floras and manuals describe Hypogymnia as lacking rhizines, a 2015 study challenges the universality of this assertion. In the study, researchers studied a large number of Hypogymnia collections, representing 72 species as well as 64 type specimens. They found that rhizines and hapters were occasionally present on the lower surface of 35 species. Two types of attachment organs are found: slender rhizines with fine and tapering tips (found in H. krogiae and H. subfarinacea), and the more common hapters, which are thick with broken tips. Both types are dark brown to black and usually the same colour as the lower surface. In all cases where these attachment organs are found, however, they are few in number and are sparsely distributed on the lower thallus surface. [11]

The apothecia of Hypogymnia are lecanorine in form with a constricted base and are often raised or shaped like an urn. The apothecial discs are red-brown and typically concave. Ascospores are colourless, ellipsoid, and number eight per ascus. [12] They are relatively small, less than 9  μm long. [15] Pycnidia are black and appear as small dots on the surface of the lobes. [12] The photobiont partner is trebouxioid–a green alga from the genus Trebouxia . [16]

The cortex contains atranorin (responsible for the grey colour), [8] while the medullae of most species have physodic acid, and some species contain other orcinol and beta-orcinol depsidones, including protocetraric acid and physodalic acid. [12]

The genus Menegazzia contains species that could be confused with Hypogymnia; Menegazzia, however, has perforations on the upper lobe surface, unlike Hypogymnia. Other superficially similar genera, such as Brodoa and Allantoparmelia , can be distinguished from Hypogymnia by their solid lobes. [12]

Habitat and distribution

Hypogymnia species usually grow on bark and wood, particular that of conifers. Less frequently, they are found on rock or mossy soil. [12] The genus has been recorded on all continents except Antarctica. In tropical to subtropical locations, Hypogymnia appears to be restricted to high elevations, where temperatures are cooler. [15] Seventeen species are recorded from the Himalayan region of India and Nepal, [17] while 31 species are present in North America. [8] In Mexico, it is relatively rare; of the 11 species recorded from there, only two are known from more than 10 collections, and only one, H. guadalupensis , is endemic to the country. [18] Nine species occur in Europe. [19] Southwestern China is a centre of biodiversity for the genus, as more than 40 species occur there. [20] It is one of the few large Parmeliaceae genera that has its main distribution in the Northern Hemisphere. [21]

Ecology

There are several lichenicolous fungi that are known to infect Hypogymnia species. Some of them parasitise specific lichens, such as Plectocarpon hypogymniae (on Hypogymnia bitteri), Lichenopeltella hypogymniae (on Hypogymnia zeylanica), Muellerella antarctica (on Hypogymnia antarctica), Phacopsis cephalodioides (on Hypogymnia physodes). Others have a less specific host range, including Abrothallus prodiens , Epithamnolia xanthoriae , Minutoexcipula calatayudii , Trichonectria anisospora , Endophragmiella franconica , Cyphobasidium hypogymniicola , Tremella hypogymniae , and Tremella papuana . [22] The thalli of Hypogymnia physodes are inhabited by various species of orbatid mites. [23]

Uses

Hypogymnia physodes has been used as a biomonitor for several applications. Examples include monitoring atmospheric nitrogen and sulphur deposition in Norway, [24] the accumulation of mercury downwind of chloralkali plant in Wisconsin, [25] and pollution from several toxic heavy metal elements following the closure of a large mine waste dump close to Zlatna, Romania. [26] It was also used to help evaluate the levels of radionuclides deposited in the environment after the East Urals (1957) and Chernobyl (1988) nuclear accidents. [27] H. tubulosa is an indicator species of old-growth forests. [28] In China, H. physodes and H. pseudoenteromorpha are used as raw materials in the preparation of litmus reagent. [29]

In 15th-century Europe, Hypogymnia physodes was one component (in addition to Evernia prunastri and Pseudevernia furfuracea ) of the popular drug "Lichen quercinus virdes". [30] In Traditional Chinese Medicine, Hypogymnia hypotrypa is used for "dim vision, bleeding from uterus, bleeding from external injury, chronic dermatitis, and sores." [31] Hypogymnia flavida and H. hypotrypa serve as raw material in the preparation of antibiotics in China. [29]

Species

About 90 species are recognized in the genus. [32]

Hypogymnia austerodes Varnished Tube Lichen (3815880397).jpg
Hypogymnia austerodes
Hypogymnia farinacea Hypogymnia farinacea T87 (1).JPG
Hypogymnia farinacea
Hypogymnia imshaugii Forked Tube Lichen (3823916124).jpg
Hypogymnia imshaugii
Hypogymnia inactiva Hypogymnia inactiva (Krog) Ohlsson 713764 crop.jpg
Hypogymnia inactiva
Hypogymnia krogiae Hypogymnia krogiae - Flickr - pellaea (2).jpg
Hypogymnia krogiae
Hypogymnia metaphysodes Deflated Tube Lichen (3823913866).jpg
Hypogymnia metaphysodes
Hypogymnia occidentalis Lattice Tube Lichen (3823905828).jpg
Hypogymnia occidentalis
Hypogymnia tubulosa Hypogymnia tubulosa - Flickr - pellaea.jpg
Hypogymnia tubulosa
Hypogymnia vittata Hypogymnia vittata - Flickr - pellaea.jpg
Hypogymnia vittata

Hypogymnia contains three species pairs: H. krogiae and the sorediate counterpart H. incurvoides, H. minilobata and the sorediate H. mollis, and H. lophyrea and the sorediate H. hultenii. [15]

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.

<span class="mw-page-title-main">Parmeliaceae</span> Family of lichens

The Parmeliaceae is a large and diverse family of Lecanoromycetes. With over 2700 species in 71 genera, it is the largest family of lichen-forming fungi. The most speciose genera in the family are the well-known groups: Xanthoparmelia, Usnea, Parmotrema, and Hypotrachyna.

<i>Trapeliopsis</i> Genus of lichen

Trapeliopsis is a genus of lichenized fungi in the family Trapeliaceae. It contains 20 species. The genus was circumscribed in 1980 by Hannes Hertel and Gotthard Schneider, with Trapeliopsis wallrothii designated as the type species.

<i>Pannaria</i> Genus of lichens in the family Pannariaceae

Pannaria is a genus of lichen-forming fungi in the family Pannariaceae. The widespread genus contains an estimated 51 species, found primarily in tropical regions.

<i>Physconia</i> Genus of lichens in the family Physciaceae

Physconia is a genus of lichen-forming fungi in the family Physciaceae. It has about 25 species. The genus was circumscribed by Czech lichenologist Josef Poelt in 1965, with Physconia pulverulenta assigned as the type species.

<i>Arctocetraria</i> Genus of lichens

Arctocetraria is a genus of foliose lichens in the family Parmeliaceae. It has three species.

<i>Lethariella</i> Genus of lichens

Lethariella is a genus of fruticose lichens in the family Parmeliaceae. The genus was originally proposed as a subgenus of Usnea by Polish lichenologist Józef Motyka in his 1936 monograph of that genus. Norwegian botanist Hildur Krog elevated the taxon to generic status in 1976.

<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>Bulbothrix</i> Genus of lichens

Bulbothrix is a genus of lichen-forming fungi in the family Parmeliaceae. This genus is synonymous with Bulbothricella V.Marcano, S.Mohali & A.Morales. Bulbothrix was circumscribed by lichenologist Mason E. Hale in 1974 with Bulbothrix semilunata as the type species.

<i>Parmotrema</i> Genus of fungi

Parmotrema is a genus of lichen belonging to the family Parmeliaceae. It is a large genus, containing an estimated 300 species, with a centre of diversity in subtropical regions of South America and the Pacific Islands.

<i>Punctelia</i> Genus of foliose lichens

Punctelia is a genus of foliose lichens belonging to the large family Parmeliaceae. The genus, which contains about 50 species, was segregated from genus Parmelia in 1982. Characteristics that define Punctelia include the presence of hook-like to thread-like conidia, simple rhizines, and point-like pseudocyphellae. It is this last feature that is alluded to in the vernacular names speckled shield lichens or speckleback lichens.

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

Lecidella is a genus of crustose lichens in the family Lecanoraceae.

Protousnea is a genus of lichenised ascomycetes in the large family Parmeliaceae. It contains two accepted species. Protousnea species have a fruticose growth form, similar to beard lichens. The genus is endemic to southern South America. The genus was circumscribed in 1976 by Hildur Krog as a segregate genus from Usnea.

Bruce Pettit McCune is an American lichenologist, botanist, plant ecologist, and software developer for analysis of ecological data.

Hypogymnia congesta is a rare species of foliose lichen in the family Parmeliaceae. Found in China, it was formally described as a new species in 2003. The lichen grows on the bark and wood of conifers and bamboo. Hypogymnia congesta has a brown to brownish-grey foliose thallus measuring up to 8 cm (3.1 in) long or broad, with a cartilage-like texture. The lichen is chemically distinct, containing physodic acid and virensic acid; the latter substance is otherwise unknown from genus Hypogymnia.

Hypogymnia wilfiana is a species of foliose lichen in the family Parmeliaceae. It is found in western North America, where it grows on conifer trees.

Hypogymnia canadensis is a species of corticolous (bark-dwelling), foliose lichen in the family Parmeliaceae. Found in western North America, it was formally described as a new species in 2007. Although Hypogymnia canadensi shares its habitat with several related species, it can be reliably identified through a combination of its morphological traits—such as narrower lobe width and smoother upper surface—and its unique chemical composition.

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