Hyphodontia mongolica 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 mongolica Min Wang, Yuan Y. Chen & B.K. Cui , sp. nov., Fig. 3

MycoBank no.: MB 819426

Diagnosis.—This species is distinguished by its dirty buff to pale dirty brown hymenial surface with partly confluent or branched aculei, a monomitic hyphal system with thick-walled generative hyphae, clavate to tubular cystidia, and ellipsoid basidiospores measuring as 4.9–6.6 × 2.5–3.2 μm.

Type.— CHINA. Inner Mongolia, Eerguna, Mordaga Forest Park, on fallen trunk of Populus , 17 September 2015 Cui 13239 (Holotype, BJFC).

Etymology.— Mongolica (Lat.) : refers to the type locality in Inner Mongolia of China.

Basidiomata. —Annual, resupinate, adnate, 3–5 mm thick including aculei, without odor or taste when fresh. Hymenial surface dirty buff to pale dirty brown, not cracked. Aculei conical or cylindrical, 2–4 per mm, up to 4 mm in length, 0.25–0.5 mm diam at base, partly confluent at base, sometimes branched apically. Subiculum dirty buff, soft corky, up to 1 mm thick.

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

Subiculum. —Generative hyphae hyaline, slightly thick-walled with a wide lumen, moderately branched, interwoven, 1.5–4 μm in diam.

Aculei.— Tramal hyphae hyaline, slightly thick-walled with a wide lumen, moderately branched, parallel along aculei, 2.5–4 μm in diam. Two kinds of cystidia usually present: (1) clavate with an inflated apical tip, thin-walled at upper part and slightly thick-walled in lower part, 70–110 × 7–13 μm; (2) tubular with slight constrictions, mostly thin-walled, 65–105 × 6–8 μm. Basidia clavate, bearing four sterigmata and a basal clamp connection, 15–24 × 4–6 μm; basidioles in shape similar to basidia, but distinctly smaller than basidia; hymenium usually collapsed.

Spores.— Basidiospores ellipsoid, hyaline, thin-walled, smooth, IKI–, CB–, (4.8–)4.9–6.6(–7) × (2.3–)2.5–3.2(– 3.5) μm, L = 5.5 μm, W = 2.9 μm, Q = 1.89–1.93 (n = 60/2).

Additional specimen (paratype) examined.— CHINA. Inner Mongolia, Eerguna, Mordaga National Forest Park, on fallen trunk of Populus , 17 September 2015 Cui 13240 (BJFC).

Figures

FIGURE 3. Microscopic structures of Hyphodontia mongolica (drawn from the holotype). a. Basidiospores; b. Basidia and basidioles; c. Hyphae from trama; d. Hyphae from subiculum; e. Clavate cystidia; f. Tubular cystidia; g. Section through an aculeus. Scale bars: a = 5 μm; b–g = 10 μm