Haploporus microsporus Meng Zhou&Y.C.Dai

Zhou, Meng, Wang, Li, May, Tom W., Vlasak, Josef, Chen, Jia-Jia & Dai, Yu-Cheng, 2019, Phylogeny and diversity of Haploporus (Polyporaceae, Basidiomycota), MycoKeys 54, pp. 77-98 : 86-89

Haploporus microsporus Meng Zhou&Y.C.Dai sp. nov. Figs 8, 9

Diagnosis.

Differs from other Haploporus species by the combination of a resupinate habit, a dimitic hyphal structure with dextrinoid skeletal hyphae, distinct small pores, 7-9 per mm, the presence of dendrohyphidia, and distinct small ellipsoid basidiospores measuring 5.3-6.7 × 3-4.1 µm.

Holotype.

CHINA. Hainan Prov., Ledong County, Jianfengling Nat. Res., on dead angiosperm tree, 23 March 2011, Dai 12147 (Holotype in BJFC).

Etymology.

Microsporus (Lat.): referring to the small basidiospores of this species.

Fruitbody.

Basidiocarps annual, resupinate, adnate, soft corky when fresh, become corky upon drying, odor- or tasteless when fresh, up to 20 cm long, 4.5 cm wide and 2 mm thick at center. Pore surface pinkish buff to clay-buff when dry; sterile margin indistinct, very narrow to almost lacking; pores angular, 7-9 per mm; dissepiments thick, entire. Subiculum cream, corky, thin, about 0.2 mm thick. Tubes light buff, corky, about 1.8 mm long.

Hyphal structure.

Hyphal system dimitic: generative hyphae bearing clamp connections, hyaline, thin-walled; skeletal hyphae dominant, thick-walled, frequently branched, dextrinoid, CB–, skeletal hyphae swollen in KOH.

Subiculum.

Generative hyphae infrequent, hyaline, thin-walled, rarely branched, 1.5-2.5 µm in diam; skeletal hyphae dominant, hyaline, thick-walled with a narrow to wide lumen, frequently branched, interwoven, 1.5-3 µm in diam.

Tubes.

Generative hyphae infrequent, hyaline, thin-walled, rarely branched, 1.5-3 µm in diam; skeletal hyphae distinctly thick-walled with a narrow lumen to subsolid, frequently branched, interwoven, 1-2 µm in diam. Cystidioles present, fusiform, 10-20 × 3.5-6 µm. Basidia barrel-shaped with 4-sterigmata and a basal clamp connection, 11-16 × 5.5-6.5 µm; basidioles dominant, similar in shape to basidia, but slightly smaller. Dendrohyphidia abundant, frequently branched. Some irregular-shaped crystals present among tube tramal structures

Spores.

Basidiospores ellipsoid, hyaline, thick-walled, with tuberculate ornamentation, dextrinoid, CB+, 5.3 –6.7(– 7) × (2.9 –)3– 4.1 µm, L = 5.98 µm, W = 3.90 µm, Q = 1.78 (n = 30/1).