Uncobasidium

Uncobasidium is a genus of two species of crust fungi in the family Meruliaceae. The genus was circumscribed by mycologists Kurt Hjorstam and Leif Ryvarden in 1978 with the European fungus U. luteolum as the type species.[1] The South American species U. roseocremeum was added to the genus in 2012.[2] The distinguishing feature of Uncobasidium is the basal hook in the basidium.

Uncobasidium
Scientific classification
Kingdom:
Fungi
Division:
Basidiomycota
Class:
Agaricomycetes
Order:
Polyporales
Family:
Meruliaceae
Genus:
Uncobasidium

Hjortstam & Ryvarden (1978)
Type species
Uncobasidium luteolum
Hjortstam & Ryvarden (1978)
Species

U. luteolum
U. roseocremeum

Description

Uncobasidium forms a crust-like fruit body, which is spread out on the surface of the substrate. Its texture is softly membranous or byssoid (as if made of fibers). The hyphal system is monomitic, meaning it contains only generative hyphae. Individual hyphae are distinct when viewed with microscopy, and they range from thin to becoming thick walled, with clamp connections. The hyphae of the subiculum are usually straight and of uniform diameter. In contrast, the hyphae of the subhymenium are twisty and sometimes strongly bent. The basidia (pleurobasidia) are roughly urniform (swollen at the base). They are strongly constricted with a hook-shaped appendage, arising in the basal septum, with four sterigmata. The spores of Uncobasidium fungi are ellipsoid to obovate in shape, thin walled, and non-amyloid.[1]

Species

Some species proposed for inclusion in Uncobasidium have been referred to other genera, including:

  • Uncobasidium albidum (Hauerslev) Vesterh. (1996)[3] = Aphanobasidium albidum (Hauerslev) Boidin & Gilles (1980)
  • Uncobasidium calongei (Tellería) Hjortstam & Tellería (1990)[4] = Cerocorticium calongei Tellería (1985)
  • Uncobasidium notabile (H.S.Jacks.) Tellería (1995)[5] = Radulomyces notabilis (H.S.Jacks.) Parmasto (1968)
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References
  1. Hjortstam, Kurt; Ryvarden, Leif (1978). "Notes on Corticiaceae (Basidiomycetes) III". Mycotaxon. 7 (2): 407–410.
  2. Gorjón, Sergio P.; Greslebin, Alina G.; Rajchenberg, Mario (2012). "Uncobasidium roseocremeum sp. nov. and other corticoid basidiomycetes from the Patagonian Andes of Argentina". Mycotaxon. 121: 349–364.
  3. Knudsen, H.; Hansen, L. (1996). "Nomenclatural notes to Nordic Macromycetes vol. 1 & 3". Nordic Journal of Botany. 16 (2): 211–221. doi:10.1111/j.1756-1051.1996.tb00960.x.
  4. Tellería, M.T. (1990). "Annotated list of the Corticiaceae, sensu lato (Aphyllophorales, Basidiomycotina), for Peninsular Spain and Balearic Islands". Bibliotheca Mycologica. 135: 118.
  5. Tellería, M.T.; Melo, I. (1995). Aphyllophorales resupinatae non poroides, I. Acanthobasidium-Cystostereum. Flora Mycologica Iberica (in Spanish). 1. Real Jardín Botánico. p. 161. ISBN 978-3-443-65006-3.
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