Yuchengia

Yuchengia B.K. Cui & K.T. Steffen 2013, in Cui, et al., Fungal Diversity 97, 137–392 (2019)

Diagnosis: Basidiocarps annual, resupinate. Pore surface cream to yellowish buff; pores angular; dissepiments thin, entire. Subiculum cream to buff, thin. Tubes concolorous with pore surface, hard corky. Hyphal system dimitic; generative hyphae hyaline, thin-walled, rarely branched, bearing clamp connections; skeletal hyphae dominant, hyaline, thick-walled with a wide to narrow lumen, usually unbranched, interwoven, weakly to distinctly amyloid, acyanophilous, dissolving in KOH. Cystidia absent; cystidioles variably present. Basidia clavate, with four sterigmata and a basal clamp connection. Basidiospores ellipsoid, non-truncate, hyaline, thick-walled, smooth, IKI–, CB +.

Index Fungorum Number: IF563490

Type species: Yuchengia narymica (Pilát) B.K. Cui, C.L. Zhao & K.T. Steffen 2013, in Cui, et al., Fungal Diversity 97, 137–392 (2019)

Notes: Yuchengia was recently proposed by Zhao et al. (2013). Only one species, Y. narymica was included in this genus. The taxonomic position of Y. narymica has long been debated. The species was firstly described as Trametes narymica Pila´t (Pila´t 1936). Later, Pouzar (1984) proposed it as Perenniporia narymica, and this was widely accepted (Gilbertson & Ryvarden 1987; Ryvarden & Gilbertson 1994; Núñez & Ryvarden 2001; Dai et al. 2002). Decock & Stalpers (2006) mentioned that the species does not belong to Perenniporia, and suggested it might belong to Diplomitoporus Doman´ski because of its non-branched skeletal hyphae and thin-walled basidiospores. However, the study of the type specimen reveals that the basidiospores are distinctly thick-walled. This character would exclude both of these genera, thus, Yuchengia was proposed to accommodate P. narymica (Zhao et al. 2013).