Haploporus crystallinus H. Zhao, Vlasak & Yuan Yuan sp. nov.

Figs 3, 4

Etymology.

crystallinus (Lat.): Refers to the species having many crystals amongst the subiculum and tube trama.

Type.

French Guiana, Roura, Camp Cayman, rotten log on the road, 27 August 2022, JV 2208/36 (Holotype PRM, isotypes BJFC 039927 and JV 2208/36). GenBank: ITS = OQ919235 , LSU = OQ919238, mtSSU = OQ919241 .

Basidiomata resupinate, perennial, inseparable from the substrate, more or less corky when dry, up to 10 cm long, 3.5 cm wide and 4 mm thick at centre. Hymenophore pinkish-buff (5A3) to cream buff (4A4) when dry, with indistinct margin; pores angular to round, 5-7 per mm; dissepiments thick, entire. Subiculum darker than tubes, more or less corky. Tubes pinkish-buff (5A3), hard corky.

Hyphal system dimitic; generative hyphae with clamp connections, hyaline, thin-walled; skeletal hyphae thick-walled, frequently branched, distinctly dextrinoid in Melzer’s reagent, cyanophilous in Cotton Blue; tissues unchanged in 2% potassium hydroxide.

Subicular generative hyphae infrequent, hyaline, thin-walled, sometimes branched, 1.0-1.5 µm in diam.; skeletal hyphae dominant, with a narrow lumen to subsolid, usually branched, flexuous, interwoven, 0.8-2.0 µm in diam. Irregular-shaped and -sized crystals frequently present.

Tube tramal generative hyphae infrequent, hyaline, thin-walled, sometime branched, 1.0-1.5 µm in diam.; skeletal hyphae dominant, with a narrow lumen to subsolid, usually branched, flexuous, interwoven, 0.8-2.0 µm in diam. Cystidioles fusiform with a sharp tip, thin-walled, hyaline, 12.0-21.0 × 3.0-4.5 µm . Basidia more or less capitate to pyriform, with four sterigmata and a clamp connection at base, 17.5-27.0 × 6.5-9.0 µm; basidioles capitate to pyriform, almost the same size of basidia. Dendrohyphidia absent. Irregular-shaped and -sized crystals frequently present.

Basidiospores ellipsoid, slightly thick-walled, tuberculate, hyaline, some with a guttule, dextrinoid in Melzer’s reagent, cyanophilous in Cotton Blue, (3.8-)4.0-5.5 × (2.1-)2.6-3.5(-3.8) µm, L (arithmetic average length) = 4.60 µm, W (arithmetic average width) = 3.03 µm, Q (L/W ratio) = 1.52 (n = 30/1).

Distribution and ecology.

Haploporus crystallinus is distributed in French Guiana and growing on rotten unidentified angiosperm log; causes a white rot.