Hyphodontia bubalina Min Wang, Yuan Y. Chen & B.K. Cui, 2017

Wang, Min & Chen, Yuan-Yuan, 2017, Phylogeny and taxonomy of the genus Hyphodontia (Hymenochaetales, Basidiomycota) in China, Phytotaxa 309 (1), pp. 45-54 : 50

Hyphodontia bubalina Min Wang, Yuan Y. Chen & B.K. Cui , sp. nov., Fig. 2

MycoBank no.: MB 819425

Diagnosis. — This species is distinguished by its thin and buff colored basidiomata, cracked into pieces when dry, a monomitic hyphal system with thin- to slightly thick-walled generative hyphae, subicular hyphae encrusted with crystals, hyphoid or subulate cystidioles, and ellipsoid to subglobose basidiospores measuring as 4–5.3 × 3–4.2 μm.

Type.— CHINA. Inner Mongolia, Genhe, Jinhe Forestry Bureau, on fallen branch of Populus , 15 September 2015, Cui 12888 (Holotype, BJFC).

Etymology.— Bubalina (Lat.) : refers to buff colored basidiomata of the species.

Basidiomata.— Annual, resupinate, adnate, up to 1 mm thick including aculei, without odor or taste when fresh, cracking into pieces when dry. Hymenial surface buff; aculei conical, 3–6 per mm, up to 1 mm long, 0.1–0.3 mm diam at base. Subiculum thin, up to 0.2 mm thick. Margin thinning out, buff colored, up to 1 mm wide.

Hyphal structure.— Hyphal system monomitic; generative hyphae with clamp connections, IKI–, CB+; tissues unchanged in KOH.

Subiculum.— Generative hyphae hyaline, thin- to thick-walled, occasionally branched, flexuous, interwoven, occasionally encrusted with irregular crystals, 2–3 μm in diam.

Aculei.— Tramal hyphae hyaline, thin- to slightly thick-walled, occasionally branched, more or less parallel along aculei, 2–5 μm in diam. Cystidia absent, cystidioles usually present, hyaline, thin-walled, hyphoid or subulate, 24–44 × 4–6 μm. Basidia clavate, with one or more slightly constrictions, bearing four sterigmata and a basal clamp connection, 17–26 × 3.5–4.5 μm; basidioles in shape similar to basidia, but smaller.

Spores.— Basidiospores ellipsoid to subglobose, hyaline, thin-walled, smooth, usually with one guttule, IKI–, CB–, (3.8–)4–5.3(–5.7) × 3–4.2 μm, L = 4.5 μm, W = 3.6 μm, Q = 1.24–1.32 (n = 90/3).

Additional specimens (paratypes) examined.— CHINA. Inner Mongolia, Genhe, Jinhe Forestry Bureau, on fallen trunk of Populus , 15 September 2015, Cui 12887 (BJFC). Hebei Province, Xinglong County, Wulingshan Nature Reserve, on rotten angiosperm wood, 29 July 2009, Cui 6834 (BJFC).

Figures

FIGURE 2. Microscopic structures of the Hyphodontia bubalina (drawn from the holotype). a. Basidiospores; b. Basidia and basidioles; c. Hyphae from trama; d. Hyphae from subiculum; e. Cystidioles; f. Section through an aculeus. Scale bars: a = 5 μm; b–f = 10 μm.