Megasporia yunnanensis Y. Yuan, X.H. Ji & Y.C. Dai

Yuan, Yuan, Ji, Xiao-Hong, Chen, Jia-Jia & Dai, Yu-Cheng, 2017, Three new species of Megasporia (Polyporales, Basidiomycota) from China, MycoKeys 20, pp. 37-50 : 40-43

Megasporia yunnanensis Y. Yuan, X.H. Ji & Y.C. Dai sp. nov. Figure 4

Diagnosis.

Differs from other Megasporia species by brownish tints on pore surface and lacking tetrahedric or polyhedric crystals.

Holotype.

CHINA. Yunnan Province, Kunming, Wild Duck Lake Park, on fallen angiosperm branch, 28 July 2014, Y.C. Dai 13870 (BJFC017600).

Basidiocarps.

Annual, resupinate, corky, without odor or taste when fresh, becoming hard corky upon drying, up to 3 cm long, 2 cm wide, and 2 mm thick at centre. Sterile margin thinning out, white when dry, up to 1 mm wide. Pore surface white to cream but with brownish tints when dry; pores round, 2-3 per mm; dissepiments thin, lacerate. Subiculum white, corky, up to 1 mm thick. Tubes cream, corky, up to 1 mm long.

Hyphal structure.

Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae weakly dextrinoid, CB+; tissues unchanged in KOH.

Subiculum.

Generative hyphae frequent, hyaline, thin-walled, occasionally branched, 2-3 µm in diam; skeletal hyphae dominant, thick-walled with a wide to narrow lumen, occasionally branched, mostly flexuous, interwoven, 3-4 µm in diam.

Tubes.

Generative hyphae infrequent, hyaline, thin-walled, occasionally branched, 2-3 µm in diam; skeletal hyphae dominant, thick-walled with a wide to medium lumen, occasionally branched, flexuous, interwoven, 2.5-3.5 µm in diam. Hyphal pegs and cystidia absent, dendrohyphidia present; cystidioles present, mostly ventricose, thin-walled, smooth. Basidia broadly clavate, with four sterigmata and a basal clamp connection, 30-35 × 9-11 µm; basidioles in shape similar to basidia, but smaller. Tetrahedric or polyhedric crystals absent.

Spores.

Basidiospores cylindrical, hyaline, thin-walled, smooth, IKI–, CB–, (15.1 –)16.5–20.8(– 21.5) × (5.1 –)5.5–7.1(– 7.5) μm, L = 18.38 μm, W = 6.19 μm, Q = 2.88-3.02 (n = 90/3).

Additional specimens (paratypes) examined.

CHINA. Yunnan Province, Nanhua County, Dazhongshan Nature Reserve, on fallen angiosperm branch, 11 Sept 2015, B.K. Cui 12594 (BJFC022530). Chuxiong, Zixishan Nature Reserve, on fallen branch of Rhododendron , 12 Sept 2015, B.K. Cui 12614A (BJFC022531).

Etymology.

Yunnanensis (Lat.): referring to the locality (Yunnan Province, China) where the species was found.