Tomnashia
Tomnashia luteominia, Palos Verdes, southern California
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Teloschistales
Family: Teloschistaceae
Genus: Tomnashia
S.Y.Kondr. & Hur (2017)
Type species
Tomnashia rosei
(Hasse) S.Y.Kondr. & (Hur 2017)
Species

T. ludificans
T. luteominia
T. nashii
T. rosei

Tomnashia is a genus of lichen-forming fungi in the family Teloschistaceae. It has four species of saxicolous (rock-dwelling), crustose lichens that occur in southwestern North America.[1]

Taxonomy

Tomnashia was circumscribed in 2017 by lichenologists Sergey Kondratyuk and Jae-Seoun Hur, who bestowed upon the taxon an eponym in honour of Thomas Hawkes Nash III, a significant contributor to lichenology, especially concerning North American lichen flora. The type species of this genus is Tomnashia rosei, which was originally described as Caloplaca rosei by Hermann Edward Hasse in 1911.[2] Through combined phylogenetic analysis, it was determined that Tomnashia resides in the outermost position among monophyletic groups of the Polycauliona subclade of the subfamily Xanthorioideae. This genus differs notably from other members of Polycauliona with its distinct characteristics and morphology.[3]

Description

Presenting a varied range of colours, the crustose thallus of Tomnashia ranges from white, grey, and greenish-yellow to yellowish orange, or apricot orange, with some species having a unique waxy translucent appearance. The small, biatorine apothecia are usually orange to reddish-brown. Another unique attribute of this genus is its ascospores, which are polarilocular and hyaline. Its distinctive chemical composition includes substances such as parietin, fallacinal, emodin, teloschistin, and parietinic acid.[3]

Habitat and distribution

Predominantly distributed in the southwestern part of North America, Tomnashia is found mainly on calcareous rock and soil, but it can also grow on non-calcareous rocks. Some related genera, such as Polycauliona and Igneoplaca, share a similar, relatively limited distribution in coastal southwestern North America. Other genera in the same subfamily, such as Massjukiella and Verrucoplaca, have a much broader distribution in the Northern Hemisphere or worldwide.[3]

Species

  • Tomnashia ludificans (Arup) S.Y.Kondr. & Hur(2017)
  • Tomnashia luteominia (Tuck.) S.Y.Kondr. & Hur (2017)
  • Tomnashia nashii (Nav.-Ros., Gaya & Hladun) S.Y.Kondr. & Hur (2017)
  • Tomnashia rosei (Hasse) S.Y.Kondr. & Hur (2017)

References

  1. ↑ "Tomnashia". Catalogue of Life. Species 2000: Leiden, the Netherlands. Retrieved 12 June 2023.
  2. ↑ Hasse, H.E. (1911). "Additions to the lichen flora of southern California. No. 6". The Bryologist. 14 (6): 100–102. doi:10.2307/3238388. JSTOR 3238388.
  3. 1 2 3 Kondratyuk, S.Y.; Lőkös, L.; Upreti, D.K.; Nayaka, S.; Mishra, G.K.; Ravera, S.; Jeong, M.-H.; Jang, S.-H.; Park, J.S.; Hur, J.-S. (2017). "New monophyletic branches of the Teloschistaceae (lichen-forming Ascomycota) proved by three gene phylogeny". Acta Botanica Hungarica. 59 (1–2): 71–136. doi:10.1556/034.59.2017.1-2.6. hdl:10447/414429.
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