Haploporus angustisporus 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 : 81-82

Haploporus angustisporus Meng Zhou&Y.C.Dai sp. nov. Figs 3, 4

Diagnosis.

Differs from other Haploporus species by the combination of its resupinate habit, a dimitic hyphal structure with dextrinoid skeletal hyphae, the absence of dendrohyphidia, and distinct narrow oblong basidiospores measuring 10-13.5 × 4-5 µm.

Holotype.

CHINA. Guangdong Prov., Lianzhou County, Nanling Nat. Res., on fallen angiosperm branch, 15 May 2009, Dai 10951 (Holotype in BJFC).

Etymology.

Angustisporus (Lat.): referring to the species having narrow basidiospores.

Fruitbody.

Basidiocarps annual, resupinate, adnate, soft corky when fresh, become corky upon drying, without odor or tasteless when fresh, up to 3 cm long, 2.5 cm wide, 2 mm thick at center. Pore surface cream to pale yellowish brown when fresh, brownish when bruised, olivaceous buff to pale brown upon drying; sterile margin indistinct, very narrow to almost lacking; pores angular, 3-5 per mm; dissepiments thick, entire. Subiculum cream, corky, thin, about 0.1 mm thick. Tubes light buff, corky, about 1.9 mm long.

Hyphal structure.

Hyphal system dimitic: generative hyphae bearing clamp connections, hyaline, thin-walled; skeletal hyphae dominant, thick-walled, frequently branched, dextrinoid, CB+, tissues unchanging 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 lumen to subsolid, frequently branched, interwoven, 1-2.5 µm in diam.

Tubes.

Generative hyphae frequent, hyaline, thin-walled, occasionally branched, 1.5-2.5 µm in diam; skeletal hyphae distinctly thick-walled with a narrow to wide lumen, frequently branched, interwoven, 1.2-2.5 µm in diam. Cystidia absent; cystidioles present, fusiform, 23-35 × 4-7 µm. Basidioles dominant, pear-shaped to subglobose, basidia barrel-shaped with 4-sterigmata and a basal clamp connection, 21-26 × 8-11 µm;. Dendrohyphidia absent. Some irregular-shaped crystals present among tube tramal structures.

Spores.

Basidiospores oblong, hyaline, thick-walled, with short tuberculate ornamentation, IKI–, CB+, 10 –13.5(– 14) × (3.5 –)4– 5 µm, L = 11.25 µm, W = 4.44 µm, Q = 2.38-2.70 (n = 60/2).

Additional specimen examined (paratype).

CHINA. Guangdong Prov., Fengkai County, Heishiding Nat. Res., on fallen angiosperm branch, 1 July 2010, Cui 9046 (in BJFC).