Dentipellis longiuscula L.L. Shen & Min Wang, 2017

Shen, Lu-Lu & Wang, Min, 2017, Morphological characteristics and molecular data reveal two new species of Dentipellis from China, Phytotaxa 323 (1), pp. 69-76 : 71

Dentipellis longiuscula L.L. Shen & Min Wang , sp. nov. ( Fig. 1 )

MycoBank no.: MB 815625

Diagnosis.—Differs from other Dentipellis species by basidiomata with moderately long spines, the absence of gloeoplerous hyphae and gloeocystidia, rough basidiospores measured as 5–6 × 3–3.6 μm.

Type.— CHINA. Guangxi Autonomous Region, Tianlin County, Cengwanglaoshan Nat. Res., alt. 1800 m, on dead angiosperm tree, 17 July 2012, He 20120717-7 (holotype, BJFC!)

Etymology.— Longiuscula (Lat.), refers to the moderately long spines.

Basidiomata. —Annual, resupinate, inseparable, without odor or taste when fresh, fragile upon drying, up to 10 cm long, 5 cm wide, 6.5 mm thick at center. Fresh spines soft, white to cream, becoming fragile, cream to buff when dry, up to 6 mm long, 3–4 per mm across base. Margin cottony, buff to clay-buff, ≤ 1 mm wide. Subiculum very thin, soft corky, buff, ≤ 1 mm thick.

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

Subiculum. — Generative hyphae hyaline, thin- to thick-walled, frequently branched, interwoven, 2–6 μm in diam. Gloeoplerous hyphae absent.

Hymenophoral trama. —Generative hyphae hyaline, thin- to slightly thick-walled, moderately branched, more or less subparallel along the spines, 2–4 μm in diam. Gloeoplerous hyphae absent.

Hymenium. —Cystidia absent; fusoid cystidioles present, hyaline, thin-walled, 19.5–23 × 3–5.5 μm; basidia clavate, with four sterigmata and a basal clamp connection, 18–22 × 4–6 μm; basidioles similar to basidia in shape, but smaller than basidia. Basidiospores ellipsoid to broadly ellipsoid, thick-walled, hyaline, minutely rough, strongly amyloid, CB+, (4.8–)5–6(–6.2) × 3–3.6(–3.8) μm, L = 5.58 μm, W = 3.37 μm, Q = 1.32–1.47 (n = 60/2).

Additional specimen examined (paratype).— CHINA. Guangxi Autonomous Region, Tianlin County, Cengwanglaoshan Nat. Res., alt. 1800 m, on dead angiosperm tree, 17 July 2012, He 20120717-5 (BJFC!).

Figures

FIGURE 1. Dentipellis longiuscula (holotype). a. Basidiospores. b. A vertical section through a spine. c. Hyphae from subiculum.