Haploporus gilbertsonii Meng Zhou, Vlasak &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 : 84-86

Haploporus gilbertsonii Meng Zhou, Vlasak &Y.C.Dai sp. nov. Figs 6, 7

Diagnosis.

Differs from other Haploporus species by its relatively large pores, 2-3 per mm, a dimitic hyphal structure with non-dextrinoid skeletal hyphae, the absence of dendrohyphidia, and wide oblong basidiospores measuring 12-15 × 6-8 µm.

Holotype.

USA. Arizona, Santa Rita Mt., Madera Canyon, on dead tree of Quercus , 20 Nov. 2016, Vlasák Jr. 1611/5-J (Holotype in PRM, isotype in JV and BJFC).

Etymology.

Gilbertsonii (Lat.): in honor of Prof. R.L. Gilbertson, the American mycologist.

Fruitbody.

Basidiocarps annual, resupinate, difficult to separate from the substrate, corky when dry, up to 10 cm long, 8 cm wide and 0.8 mm thick at center. Pore surface pale buff to buff when dry; sterile margin indistinct, very narrow to almost lacking; pores round to angular, 2-3 per mm; dissepiments thick, entire. Subiculum cream, corky, thin, about 0.3 mm thick. Tubes light buff, corky, about 0.5 mm long.

Hyphal structure.

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

Subiculum.

Generative hyphae infrequent, hyaline, thin-walled, occasionally branched, 2-3 µm in diam; skeletal hyphae dominant, hyaline, distinctly thick-walled, frequently branched, interwoven, 1.5-3 µm in diam.

Tubes.

Generative hyphae infrequent, hyaline, thin-walled, occasionally branched, 1-3 µm in diam; skeletal hyphae dominant, distinctly thick-walled, frequently branched, interwoven, 2-4 µm in diam. Cystidia absent; cystidioles present, fusiform, hyaline, thin-walled, 13-23 × 4.5-6 µm. Basidia pear-shaped to barrel-shaped with 4 -sterigmata and a basal clamp connection, occasionally with a few large guttules, 21-25 × 10-14 µm; basidioles dominant, similar in shape to basidia, but slightly smaller. Dendrohyphidia absent. Some irregular-shaped crystals present among tube tramal structures.

Spores.

Basidiospores oblong, hyaline, thick-walled, with tuberculate ornamentation, IKI–, CB+, 12 –15(– 16) × (5.5 –)6– 8 µm, L = 14.07 µm, W = 6.9 µm, Q = 1.83-2.15 (n = 60/2).

Additional specimen examined (paratype).

USA. Arizona, Chiricahua Mt., Turkey Canyon, on dead tree of Quercus , 5 Sep. 2012, Vlasák Jr. 1209/63-J (JV, dupl. in BJFC).