Cryptoporus

Cryptoporus (Peck) Shear 1902, in Cui, et al., Fungal Diversity 97, 137–392 (2019)

Diagnosis: Basidiocarps annual, pileate, solitary, ungulate to oblate spheroidal. Pilei cream to deep pinkish buff; margin of pilei extending over the pore surface as a volva with a small basal opening. Pore surface pale to dark brown; pores round; dissepiments thick, entire. Context cream to buff. Tubes obviously paler than pore surface, hard corky. Hyphal system trimitic; generative hyphae bearing clamp connections; skeletal hyphae dominant, hyaline, non-dextrinoid, cyanophilous. Cystidia absent; cystidioles fusiform. Basidia clavate, with four sterigmata and a basal clamp connection. Basidiospores cylindrical to oblong-ellipsoid, hyaline, thick-walled, smooth, IKI–, CB+.

Cryptoporus was established by Shear (1902). Species in the genus have petiolate or nearly sessile basidiocarps with the margin of the pilei extending over the pore surface as a volva with a small basal opening. The hyphal system is trimitic with clamped generative hyphae and non-dextrinoid skeletal hyphae, and basidiospores are thick-walled, hyaline and cylindrical (Gilbertson & Ryvarden 1987). The genus was suggested to be closely related to Trametes Fr. due to the trimitic hyphal system and cylindrical basidiospores (Ryvarden 1991). Hibbett and Donoghue (1995) inferred that Cryptoporus and Trametes belong to one of their seven studied groups based on a phylogenetic classification of the Polyporaceae through parsimony analysis of mitochondrial ribosomal DNA sequences. Moreover, Ganoderma P. Karst. is the closest genus to Cryptoporus among the genera that they studied. Cryptoporus has long been known as a monotypic genus, with the generic type of C. volvatus (Peck) Shear, until C. sinensis Sheng H. Wu & M. Zang (Wu and Zang 2000) was described.