Luteoporia albomarginata

Luteoporia albomarginata F. Wu, Jia J. Chen & S.H. He 2016, in Wu et al., Phytotaxa 263 (1): 37 (2016)

Etymology. Albomarginata (Lat.): referring to the white margin.

Diagnosis: Fruiting body. Basidiocarps annual, resupinate, up to 50 cm long, 15 cm wide, and 2 mm thick at the center, soft and without odor or taste when fresh, becoming corky to hard corky upon drying; sterile margin cottony to rhizomophic, thinning out, white when fresh, become yellow when dry, up to 2 mm. Pore surface pale yellow to yellow when fresh, becoming straw-colored when dry; pores angular to irregular, mostly 2–4 per mm, but sometimes 1–2 per mm; dissepiments thin, lacerate. Subiculum white when fresh, soft corky, becoming yellow and corky when dry, about 0.5 mm thick. Tubes concolorous to pores, corky, up to 1.5 mm long.

Hyphal structure. Hyphal system monomitic; generative hyphae bearing fine yellow crystals, frequently bearing clamp connection, occasionally simple septate, rarely branched; tissues becoming purple but otherwise unchanged in KOH.

Subiculum. Generative hyphae hyaline, thin- to slightly thick-walled, frequently branched with frequent clamp connections, regularly arranged, IKI-, CB-, 4–6 μm in diam.

Tubes. Tramal hyphae hyaline, thin-walled, frequently branched with frequent clamp connections, loosely interwoven, IKI-, CB-, 3–5 μm in diam. Some hyphae with swollen tips, mostly 10–15 μm in diam., the swollen tips projecting out of hymenium, cystidia-like. Fusoid cystidioles occasionally present; basidia subclavate to barrel-shaped, thin-walled with a basal clamp connection and four sterigmata, 10–12 × 4–4.8 μm; basidioles in shape similar to basidia, but slightly smaller.

Basidiospores. oblong-ellipsoid, hyaline, thin-walled, smooth, tapering at apiculus, IKI-, CB-, (3.7–)3.9–5(–5.2) × 1.8–2.2 μm, L = 4.26 μm, W = 2.01 μm, Q = 2.09–2.16 (n=60/2).