Fungalpedia – Note 41 Trichocybe
Citation if using this entry: Fallahi et al. (2023) New genera in 2010-2011. Mycosphere (in prep)
The non-monophyletic nature of the genus Clitocybe (Fr.) Staude was revealed based on the molecular studies by Moncalvo et al. (2002) and Matheny et al. (2006). Later, the combined study of morphology and phylogeny (LSU and 5.8S-rDNA) showed that Clitocybe puberula is not closely linked to C. nebularis (the type species) or to any other extant species of Clitocybe (Vizzini et al. 2010). The systematic position of Clitocybe puberula was always dubious based on the works of Huijsman (1971), and Kuyper (1983). Thus, the genus Trichocybe was erected to accommodate this species and typified by Trichocybe puberula (Synonym: Clitocybe puberula Kuyper) under the family Tricholomataceae (Vizzini et al. 2010). Trichocybe puberula is a fairly rare species, usually found in northwestern Europe (Vizzini et al. 2010). The genus name originates from the Greek words ‘trichós’ meaning hair and ‘kúbe’ meaning head’, which refers to the intricate trichodermamic structure of the pileipellis. Trichocybe differs from its related clitocyboid genera through a distinctive combination of macro- and micro-morphological characteristics (Vizzini et al. 2010). Initially, it forms hemispherical basidiomes, that become funnel-shaped with age.
Fig 1– Basidiomes of Trichocybe puberula (a, b, and c). Scale bars=10 mm. Photo credits by Enzo Musumeci.
Basidia are claviform to pear-shaped, hyphae are clamped with basal clamp connections, and basidiospores are smooth, hyaline, thin-walled, inamyloid, non-dextrinoid, and acyanophilous. Trichocybe has a distinct, significantly different trichodermal pileipellis. It also produces a subpellis with vesiculose-physaloid element. Cheilocystidia are scattered, mostly cylindrical, sublageniform, curved, and flexuous (Vizzini et al. 2010).
Type species: Trichocybe puberula (Kuyper) Vizzini
Fig 2– Trichocybe puberula (Redrawn from Vizzini et al. (2010)). a, b Cheilocystidia. c Basidiospores. d Basidia. e Stipitipellis. f Pileipellis and subpellis. Scale bars: a, b = 10 μm.
Matheny PB, Curtis JC, Hofstter V, Aime MC, Moncalvo JM, Ge ZW, Yang ZL, Slot JC, Ammirati JF, Baroni TJ, Bougher NL, Hughes KW, Lodge DJ, Kerrigan RW, Seidl MT, Aanen DK, DeNitis M, Daniele GM, Desjarden DE, Kropp BR, Norvell LL, Parker A, Vellinga EC, Vilgalys R, Hibbett DS. 2006– Major clades of Agaricales: a multi-locus phylogenetic overview. Mycologia 98, 982–995. https://www.tandfonline.com/doi/abs/10.1080/15572536.2006.11832627?journalCode=umyc20
Moncalvo JM, Vilgalys R, Redhead SA, Johnson JE, James TY, Aime MC, Hofstetter V, Verduin SJW, Larsson E, Baroni TJ, Thorn RG, Jacobsson S, Clémençon H, Miller OKM 2002– One hundred and seventeen clades of euagarics. Molecular Phylogenetic Evolution 23, 357–400. https://pubmed.ncbi.nlm.nih.gov/12099793/
Huijsman HSC. 1971– Over reviviscentie bij Agaricales. Coolia 15 (2), 35–40
Kuyper TW. 1983– A new species of Clitocybe. Sydowia 36, 173–175. https://www.zobodat.at/pdf/Sydowia_36_0173-0175.pdf
Vizzini A, Musumeci E, Murat C. 2010- Trichocybe, a new genus for Clitocybe puberula (Agaricomycetes, Agaricales). Fungal Diversity 42, 97-105. https://link.springer.com/article/10.1007/s13225-010-0030-8
Maryam Fallahi, Center of Excellence in Fungal Research, Mae Fah Luang
University, Chiang Rai 57100, Thailand.
(Edited by Kevin D Hyde and Ishika Bera)