Hypogymnia

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Hypogymnia
Hypogymnia physodes.jpeg
Hypogymnia physodes
Scientific classification e
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. Hypogymnia Nyl. (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. The lichens usually grow on the bark and wood of coniferous trees.

Hypogymnia was created by botanist 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 botanist 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]

Synonymy[]

Synonyms of Hypogymnia are Cavernularia, created by Gunnar Degelius in 1937,[13] 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;[14] Degelius called these minute cavities (about 0.1 mm diameter) "cavernulae".[13] 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.[14]

Description[]

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

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.[14] Pycnidia are black and appear as small dots on the surface of the lobes.[12] The cortex contains atranorin (responsible for the grey colour),[8] while the medullae of most species have , and some species contain other orcinol and beta-orcinol depsidones, including and .[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.[14] Seventeen species are recorded from the Himalayan region of India and Nepal,[15] while 31 species are present in North America.[8] Southwestern China is a centre of biodiversity for the genus, as more than 40 species occur there.[16] It is one of the few large Parmeliaceae genera that has main distribution in the Northern Hemisphere.[17]

Uses[]

Hypogymnia physodes has been used as a biomonitor for several applications. Examples include monitoring atmospheric nitrogen and sulphur deposition in Norway,[18] the accumulation of mercury downwind of chloralkali plant in Wisconsin,[19] and pollution from several toxic heavy metal elements following the closure of a large mine waste dump close to Zlatna, Romania.[20] 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.[21] H. tubulosa is an indicator species of old-growth forests.[22] In China, H. physodes and H. pseudoenteromorpha are used as raw materials in the preparation of litmus reagent.[23]

In 15th-century Europe, Hypogymnia physodes was one component (in addition to Evernia prunastri and Pseudevernia furfuracea) of the popular drug "Lichen quercinus virdes".[24] In Traditional Chinese Medicine, Hypogymnia hypotrypa (Folk name: 黄袋衣 (huáng dài yī), 粉黄袋梅衣 (fěn huáng dài méi yī)) is used for "dim vision, bleeding from uterus, bleeding from external injury, chronic dermatitis, and sores."[25] Hypogymnia flavida and H. hypotrypa serve as raw material in the preparation of antibiotics in China.[23]

Species[]

About 90 species are recognized in the genus.[26]

Hypogymnia austerodes
Hypogymnia farinacea
Hypogymnia imshaugii
Hypogymnia inactiva
Hypogymnia krogiae
Hypogymnia metaphysodes
Hypogymnia occidentalis
Hypogymnia tubulosa
Hypogymnia vittata
  • Goward, Björk & T.B.Wheeler (2011)[27]
  • Tchaban. & McCune (2001)[28] – east Asia
  • K.Yoshida (2001)[29] – Japan
  • Räsänen (1943)
  • Elix (1989)[30]
  • (Krog) McCune (2008) – Alaska; Russia
  • (Mont.) Filson (1970)
  • McCune (2002)[31] – Portugal
  • Hypogymnia bulbosa McCune & Li S.Wang (2003)[32] – China
  • Goward & McCune (2007)[33] – North America
  • McCune (2014)[16] – China
  • McCune & Krog (2008)[34] – Alaska; Far East Russia
  • Hypogymnia congesta McCune & C.F.Culb. (2003)[32] – China
  • McCune, Divakar & Upreti (2012)[15] – Himalayas
  • Goward (2012)[35] – American Cordillera
  • Hypogymnia diffractaica McCune (2003)[32] – China
  • (Sm.) Räsänen (1967)
  • C.W.Dodge (1959)[36] – Africa
  • (Hillmann) Rass. (1956)
  • Elix (1980)[7]
  • Zopf (1907)
  • McCune & Krog (2008)[34] – Aleutian Islands; other islands in the Bering Sea; Seward Peninsula
  • McCune & Obermayer (2001)[37] – China
  • (Hillmann ex Sato) Rass. (1956)
  • (Asahina) Kurok. (1971)
  • McCune (2002)[38]
  • McCune (2002)[39]
  • J.C.Wei (1984)[40]
  • L.H.Pike (1982)[41] – North America
  • Kurok. (1971)[42] – Japan
  • Hypogymnia hultenii (Degel.) Krog (1951)
  • (Nyl.) Rass. (1956)
  • Hypogymnia imshaugii Krog (1968)[43] – Alaska
  • (Krog) Ohlsson (1973)
  • Rass. (1967)[44]
  • C.W.Dodge (1959)[36] – Africa
  • McCune (2011)[45] – southwest China; Nepal; Japan
  • (J.C.Wei) J.B.Chen & J.C.Wei (1989)
  • C.W.Dodge (1959)[36] – Africa
  • Elix (1980)[7] – Australia
  • Ohlsson (1973)[46] – North America
  • J.C.Wei & Y.M.Jiang (1980)[47] – Tibet
  • D.Hawksw. & Poelt (1973)[48] – Greece; Morocco
  • Hypogymnia laxa McCune (2003)[32] – China
  • J.B.Chen (1994)
  • (Pers.) Krog (1968)
  • (Ach.) Krog (1951)
  • (J.D.Zhao) J.C.Wei (1991)
  • (Tav.) D.Hawksw. (1973)
  • X.L.Wei & McCune (2010)[49] – China
  • (Asahina) Rass. (1967)
  • McCune & C.L.Schoch (2009)[50] – United States
  • L.H.Pike & Hale (1982)[41] – North America
  • (Nyl.) Oxner ex Rass. (1956)
  • (Zahlbr.) Rass. (1967)
  • McCune & Li S.Wang (2014)[16] – China
  • (Bitter) Räsänen (1943)
  • Hypogymnia occidentalis L.H.Pike (1982)[41] – Oregon
  • Goward (1988)[51] – North America
  • McCune, Tchaban. & X.L.Wei (2015)[52] – Russian Far East; China
  • (Zahlbr.) Elix (1989) – Java; Papua New Guinea; Philippines; North Borneo
  • McCune & Li S.Wang (2014)[16] – China
  • Hypogymnia physodes (L.) Nyl. (1896)
  • Goward, T.Sprib. & Ahti (2012)[35] – American Cordillera
  • X.L.Wei & J.C.Wei (2012)[53] – China
  • J.C.Wei & Y.M.Jiang (1980)[47] – Tibet
  • (D.D.Awasthi) D.D.Awasthi (1971)
  • Hypogymnia pseudocyphellata McCune & E.P.Martin (2003)[32] – China
  • M.J.Lai (1980)[54] – Japan
  • (Asahina) Rass. (1967)
  • Hypogymnia pseudopruinosa X.L.Wei & J.C.Wei (2006)[55] – China
  • (Bitter) Elix (1980)
  • (Nyl.) Elix (1980)
  • Goward, Björk & Hollinger (2010)[56] – North America
  • C.W.Dodge (1959)[36] – Africa
  • Tchaban. & McCune (2002)[28] – east Asia
  • Goward (2012)[35] – American Cordillera
  • McCune & Li S.Wang (2014)[16] – China
  • McCune (2002)[57]
  • G.P.Sinha & Elix (2003)[58] – Sikkim, India
  • J.C.Wei & Y.M.Jiang (1980)[47] – China
  • (Hillmann) K.Yoshida (2001) – China; Japan; Taiwan
  • (J.D.Zhao, L.W.Hsu & Z.M.Sun) J.C.Wei & Y.M.Jiang (1986)
  • (Flot.) Kurok. (1971)
  • (Rass.) Rass. (1973)
  • X.L.Wei & J.C.Wei (2006)[55] – China
  • (Oxner) Rass. (1967)
  • (Vain.) Poelt (1962)
  • (Kremp.) Filson (1970)
  • (J.D.Zhao) J.C.Wei (1991)
  • M.J.Lai (1980)[54] – Taiwan
  • Elix (1989)[30]
  • D.Hawksw. & P.James (1973)[48] – Canary Islands
  • McCune & Li S.Wang (2014)[16] – China
  • (Müll.Arg.) D.D.Awasthi (1985)
  • (Taylor) Elix (1980)
  • Hypogymnia tubulosa (Schaer.) Hav. (1918)
  • (Bitter) Elix (1980)
  • Goward (2012)[35] – American Cordillera
  • Hypogymnia vittata (Ach.) Parrique (1898) – Asia; Europe; North America
  • (Müll.Arg.) D.D.Awasthi (1985)
  • Goward, T.Sprib. & Ahti (2010)[56] – North America
  • Y.M.Jiang & J.C.Wei (1990) – China
  • (R.Sant.) D.D.Awasthi & Kr.P.Singh (1971) – Sri Lanka

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.[14]

References[]

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Cited literature[]

  • Nash, Thomas; Ryan, Bruce D.; Diederich, P; Gries, Corinna; Bungartz, Frank, eds. (2002). Lichen Flora of the Greater Sonoran Desert Region. 1. Tempe, Arizona: Lichens Unlimited, Arizona State University. ISBN 978-0-9716759-1-9. OCLC 50120839.
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