Parvixerocomus G. Wu & Zhu L. Yang, in Wu et al., Fungal Diversity 81(1): 1–24 (2015)
Etymology: “Parvixerocomus” refers to the Xerocomus like small basidioma.
Diagnosis: This genus differs from all other genera of Boletaceae by its small basidiomata (usually <4 cm in diam.) with yellow hymenophoral tubes and pores which stain blue when bruised, ovoid to ellipsoid smooth spores, and an epithelioid pileipellis.
Basidioma stipitate-pileatewith tubular hymenophore, small. Pileus convex to applanate, subtomentose, dry; context yellowish to yellow, staining blue immediately when injured. Hymenophore subdecurrent, often with teeth on the apex of stipe; Hymenophoral surface yellowish to yellow, staining blue immediately when injured; pores irregular, angular to nearly round, often compound; tubes concolorous with hymenophoral surface, staining blue immediately when injured. Stipe central, light brown, brownish red to reddish brown, surface often pruinose; Basal mycelia cream to grayish yellowish. Pileipellis an epithelium composed of submoniliform to moniliform hyphae with cystidioid terminal cells. Pleuro- and cheilocystidia subfusiform-ventricose or clavate, with subacute apex or with long beak. Basidiospores smooth, ovoid to ellipsoid, yellowish to brownish yellow. Clamp connections absent.
Index Fungorum number: IF 811420
Type species: Parvixerocomus pseudoaokii G. Wu, K. Zhao & Zhu L. Yang 2015, in Wu et al., Fungal Diversity 81(1): 1–24 (2015)
Parvixerocomus aokii (Hongo) G. Wu, N.K. Zeng & Zhu L. Yang 2015
Parvixerocomus pseudoaokii G. Wu, K. Zhao & Zhu L. Yang 2015
Wu G, Zhao K, Li Y-C, Zeng N-K, Feng B, Halling RE, Yang Z-L (2016) Four new genera of the fungal family Boletaceae. Fungal Divers, 81(1):1–24