Rhizocarpon

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Rhizocarpon
Rhizocarpon geographicum01.jpg
Rhizocarpon geographicum
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Rhizocarpales
Family: Rhizocarpaceae
Genus: Rhizocarpon
Ramond ex DC. (1805)
Type species
Rhizocarpon geographicum
(L.) DC. (1805)
Species

See text

Synonyms [1]
List
  • Buellia sect. Catocarpus Körb. (1855)
  • Catillariopsis(Stein) M.Choisy (1950)
  • Catocarpus(Körb.) Arnold (1871)
  • Catocarpus sect. Catillariopsis Stein (1879)
  • Cormothecium A.Massal. (1854)
  • Diphaeis Clem. (1909)
  • DiphanisClem. (1909)
  • Lepidoma Link (1809)
  • PhalodictyumClem. (1909)
  • Rehmia Kremp. (1861)
  • Rhizocarponomyces Cif. & Tomas. (1953)

Rhizocarpon is a genus of crustose, saxicolous (or sometimes lichenicolous), lecideoid lichens in the family Rhizocarpaceae. The genus is common in arctic-alpine environments, but also occurs throughout temperate, subtropical, and even tropical regions. They are commonly known as map lichens because of the prothallus forming border-like bands between colonies in some species, like the common map lichen ( Rhizocarpon geographicum ).

Contents

Taxonomy and phylogeny

Together with three small genera ( Catolechia , Poeltinula and Epilichen ), Rhizocarpon constitutes the family Rhizocarpaceae. [2] [3] [4] Historically, ca 389 names have been used. [5] However, many species concepts are ill-defined, many names have been synonymized [6] and new species are regularly being described, [7] [8] [9] [10] so true number of species is not entirely clear as of now, but is estimated to be around 200. [9] [10] [11] [12] In molecular work, the genus has also been shown to be paraphyletic, with closely related genera being nested within Rhizocarpon. [3] [13]

Common traits

With so many species in a morphologically diverse genus it is difficult to say something general about morphology and anatomy and there will inevitably be some exceptions. However, they do share some key traits. They are all crustose and mostly saxicolous (rock-living), with some being lichenicolous (lichen parasites) on other saxicolous lichens. They are all lecideoid, meaning they have apothecia without a thallus margin containing algae.

Ascus and ascospores

The genus has a distinct type of ascus, the Rhizocarpon-type, [14] which is bitunicate with the inner ascus-wall being slightly apically thickened. Ascospores are considered important characters for determining species within the genus. They are either 2-celled (1-septate) or multi-celled (muriform) and are either hyaline or pigmented (green or brown), often with a characteristic halo ( perispore ) visible when viewed in a microscope. Asci contain eight, two or rarely one spore. [6] [8] [11] [13]

Species

As of October 2022, Species Fungorum (in the Catalogue of Life) accepts 75 species of Rhizopogon. [15]

Related Research Articles

<i>Bacidia</i> Genus of lichens

Bacidia is a genus of lichen-forming fungi in the family Ramalinaceae. The genus was circumscribed by Giuseppe De Notaris in 1846. Species in the genus are crust-like lichens with stemless apothecia; they have green algae (chloroccoid) as photobionts. Their asci have 8 colorless, cylindrical to acicular, multiseptate spores, with curved and thread-like conidia.

<i>Ochrolechia</i> Genus of fungi

Ochrolechia is a genus of crustose lichens in the family Ochrolechiaceae.

<i>Phyllopsora</i> Genus of lichenised fungi in the family Ramalinaceae

Phyllopsora is a genus of lichenized fungi in the family Ramalinaceae. It was circumscribed by Swiss botanist Johannes Müller Argoviensis in 1894.

<i>Porina</i> Genus of fungi

Porina is a genus of lichens in the family Trichotheliaceae. A 2020 estimate places about 145 species in the widespread genus.

<i>Micarea</i> Genus of lichen

Micarea is a genus of lichenized fungi in the family Pilocarpaceae. The widely distributed genus contains 126 species and new species are described actively. Species in the genus are crustose lichens and their photobiont is a single-celled green alga.

<i>Amandinea</i> Genus of lichens

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Agonimia is a genus of lichen-forming fungi in the family Verrucariaceae.

<i>Thelidium</i> Genus of lichens

Thelidium is a genus of lichen-forming fungi in the family Verrucariaceae. The genus was circumscribed in 1855 by Italian lichenologist Abramo Bartolommeo Massalongo, who assigned Thelidium amylaceum as the type species.

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

Ramboldia is a genus of lichen-forming fungi in the family Ramboldiaceae. The genus was circumscribed in 1994 by Gintaras Kantvilas and John Alan Elix. It was emended in 2008 by the inclusion of Pyrrhospora species containing the anthraquinone russulone in their apothecia and having a prosoplectenchymatous exciple. The family Ramboldiaceae was circumscribed in 2014 to contain the genus.

Poeltiaria is a genus of lichen-forming fungi in the family Lecideaceae. It was circumscribed in 1984 by lichenologist Hannes Hertel, with Poeltiaria turgescens assigned as the type species.

<i>Porpidia</i> Genus of lichenised fungi in the family Lecideaceae

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Megalaria is a genus of lichen-forming fungi in the family Ramalinaceae. The genus was circumscribed by Austrian lichenologist Josef Hafellner in 1984, with Megalaria grossa assigned as the type species.

<i>Tephromela</i> Genus of lichens

Tephromela is a genus of lichens in the family Tephromelataceae. There are about 25 species in this widespread genus.

<i>Catillaria</i> Genus of lichen

Catillaria is a genus of crustose lichens in the family Catillariaceae. The genus was circumscribed by Italian lichenologist Abramo Bartolommeo Massalongo in 1852. It is the type genus of Catillariaceae, which was circumscribed by Austrian lichenologist Josef Hafellner in 1984.

Bryobilimbia is a genus of lichen-forming fungi belonging to the family Lecideaceae. It was circumscribed in 2014 by Alan Fryday, Christian Printzen, and Stefan Ekman. The type species is Bryolimbia hypnorum.

References

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