Hyphoderma weishanense 

Hyphoderma weishanense Y. Yang & C.L. Zhao

MycoBank no.: 849950.

Basidiomata, Annual, resupinate, adnate, membranous when fresh, hard membranous when dry, odorless and up to 11 cm long, 4 cm wide and 50–100 µm thick. Hymenial surface smooth, white when fresh, slightly buff to buff upon drying. Sterile margin thin, white, up to 1–2 mm wide.

Hyphal system—Monomitic; generative hyphae with clamp connections; colorless, thin-walled, interwoven, 2.5–3.5 µm in diameter; IKI–, CB–, tissues unchanged in KOH. Hymenium Cystidia absent; basidia subcylindrical, constricted in the middle to somewhat sinuous, with four short sterigmata and a basal clamp connection, 16.5–18.7 × 4.5–7.5 µm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores broadly ellipsoid, colorless, thin-walled, smooth, IKI–, CB–, (4–)4.5–8.5(–9) × (3–)4–7(–8) µm, L = 6.25 µm, W = 5.23 µm, Q = 1.20 (n = 30/1).

Notes: Hyphoderma floccosum, H. obtusiforme, H. puerense C.L. Zhao & Q.X. Guan, H. transiens and H. tropicum are similar to H. weishanense by having the ellipsoid basidiospores. However, H. floccosum differs in H. weishanense by having ceraceous basidiomata, farinaceous hymenial surface and two types of cystidia: septate cystidia and tubular cystidia; H. obtusiforme is distinguished from H. weishanense by having porulose hymenial surface, cylindrical cystidia (50–60 × 8–10 µm), larger basidia (30–40 × 6–8 µm) and larger basidiospores (10–12 × 5–6 µm); H. puerense is separated from H. weishanense by the byssoid basidiomata, thick-walled generative hyphae covered by crystals and the tubular cystidia; H. transiens is distinct from H. weishanense by having the ceraceous basidiomata, odontioid hymenial surface, subcylindrical cystidia and larger basidiospores (9–13 × 3–4.5 µm); and H. tropicum differs from H. weishanense by having tubercula hymenial surface, the moniliform cystidia and larger basidia (29.5–38 × 4–6 µm). Hyphoderma anthracophilum, H. cremeoalbum, H. fissuratum, H. sibiricum (Parmasto) J. Erikss. & Å. Strid and H. tenuissimum C.L. Zhao & Q.X. Guan are similar to H. weishanense by absent cystidia. However, H. anthracophilum is separated from H. weishanense by the pale grey to isabelline hymenial surface and larger basidia (30–40 × 5–7 µm) [5]; H. cremeoalbum differs in H. weishanense by having larger basidia (30–45 × 7–9 µm) and larger basidiospores (10–14 × 5–6 µm); H. fissuratum is distinct from H. weishanense by having ceraceous basidiomata, larger basidia (24–28 × 4–4.5 µm) and cylindrical basidiospores; and H. sibiricum is distinguished from H. sordidum by the small irregular patches of basidiomata and larger basidia (25–35 × 5–7 µm).

Fig. 1 Maximum parsimony strict consensus tree illustrating the phylogeny of three new species and related species in Hyphoderma within Polyporales based on ITS+nLSU+mt-SSU+RPB1+RPB2 sequences. The branch is labeled with a maximum likelihood lead value greater than 70%, a reduced lead value greater than 50% and a Bayesian posterior probability greater than 0.95. The new species are in bold/green, the holotypes superscript “T”.