Daedaleopsis hainanensis Hai J. Li & S.H. He, 2016

Li, Hai-Jiao, Si, Jing & He, Shuang-Hui, 2016, Daedaleopsis hainanensis sp. nov. (Polyporaceae, Basidiomycota) from tropical China based on morphological and molecular evidence, Phytotaxa 275 (3), pp. 294-300 : 296-299

Daedaleopsis hainanensis Hai J. Li & S.H. He , sp. nov. ( Figs. 2 , 3 )

MycoBank: MB 816543

Diagnosis: —The species is distinct by annual, sessile, flabelliform, dimidiate or semicircular basidiocarps with a glabrous, more or less yellowish-brown and concentrically sulcate pileal surface, a rose to pink margin of pore surface when fresh, round pores, presence of dendrohyphidia and hyphal pegs in the hymenium, and allantoid to cylindrical basidiospores 6–8 × 1.7–2.2 μm.

Type:— CHINA. Hainan Prov., Ledong County, Jianfengling Nature Reserve, on fallen angiosperm trunk, 17 November 2007, Cui 5178 (BJFC003219, holotype!).

Etymology:— hainanensis (Lat.) refers to the type locality of the species.

Fruiting body:—Basidiocarps annual, sessile, flabelliform, dimidiate or semicircular, usually single, without odor or taste when fresh, corky and distinctly light in weight upon drying. Pilei applanate, projecting up to 3.2 cm, 5.3 cm wide and 3 mm thick at base. Pileal surface glabrous, pale yellowish-brown (5B/C7) to greyish brown (5/6E4) when fresh, turning yellowish-brown (5B/C7) to cinnamon-buff (4/5B4) when dry, concentrically sulcate, sometimes slightly warted at base; margin acute. Pore surface pale grey (7C2) to fuscous (5/6F5) with a distinct rose to pink margin when fresh, turning yellowish-brown to greyish-brown with a pale yellowish-brown margin; pores round to slightly elongated, 3–4 per mm; dissepiments thin to moderate thick, entire. Context pale yellowish-brown to yellowish-brown, soft corky, up to 2 mm thick near the base. Tubes yellowish-brown to pale greyish-brown, up to 1 mm long.

Hyphal structure: —Hyphal system trimitic; generative hyphae bearing clamp connections; skeletal and binding hyphae IKI–, CB–; tissues unchanged in KOH.

Context: —Generative hyphae scanty, hyaline, thin-walled, branched, 2.5–3.5 μm in diam.; skeletal hyphae dominant, pale yellowish-brown, thick-walled to subsolid, rarely branched, interwoven, 3–5 μm in diam.; binding hyphae pale yellowish-brown, thick-walled to almost solid, branched, interwoven, 2–3.2 μm in diam.

Tubes: —Generative hyphae infrequent, hyaline, thin-walled, rarely branched, 2–2.5 μm in diam.; skeletal hyphae dominant, yellowish-brown to golden yellowish, thick-walled to subsolid, rarely branched, interwoven, 2.5–3.4 μm in diam.; binding hyphae yellowish-brown to golden yellowish, flexuous, thick-walled to almost solid, branched, 2–2.8 μm in diam. Cystidia and cystidioles absent, dendrohyphidia and hyphal pegs present in the hymenium. Basidia clavate, with four sterigmata and a basal clamp connection, 20–25 × 5–6 μm; basidioles similar to basidia but slightly smaller.

Spores: —Basidiospores allantoid to cylindrical, usually tapering towards the apiculum, hyaline, thin-walled, smooth, IKI–, CB–, 6–8 × (1.5–)1.7–2.2 μm, L = 6.9 μm, W = 1.8 μm, Q = 3.8 (n = 40/1).

Type of rot: —Causing a white rot.

Additional specimens examined: — CHINA. Hainan Prov., Ledong County, Jianfengling Nature Reserve , on fallen angiosperm trunk, 17 November 2007, Cui 5187 ( BJFC003228 , paratype!) ; on fallen angiosperm branch, 17 November 2007, Dai 9268 ( BJFC000704 , paratype!) .

Figures

FIGURE 2. Basidiocarps of Daedaleopsis hainanensis (holotype, scale bar = 2 cm).

FIGURE 3. Microscopic structures of Daedaleopsis hainanensis (drawn by Hai-Jiao Li from the holotype). a. Basidiospores. b. Basidia and basidioles. c. dendrohyphidia. d. Hyphae from trama. e. Hyphae from context.