Fragiliporia fragilis Y.C. Dai, B.K. Cui & C.L. Zhao, in Zhao et al., Fungal Diversity 70: 119 (2015)
Etymology: fragilis (Lat.) referring to the brittle basidiocarps.
Diagnosis: Basidiocarps annual, resupinate, very soft, without odor or taste when fresh, when dry becoming brittle and powdery when bruised, up to 15 cm long, 5 cm wide, 6 mm thick at center. Pore surface grayish-buff to lavender when fresh, turning to vinaceous gray to grayish brown upon drying; pores angular, 0.5–1 per mm; dissepiments thin, entire. Sterile margin distinct, white, more or less fimbriate, up to 6 mm wide. Subiculum orange-yellow, up to 0.5 mm thick. Tubes concolorous with pore surface, fragile when dry, up to 5.5 mm long.
Basidiospores allantoid, hyaline, thin-walled, smooth, IKI–, CB–, (4.6–)4.8–5.4(−5.6)×(1.5–)1.7–2(−2.2) μm, L=5.05 μm, W=1.89 μm, Q=2.57–2.73 (n=180/6). Tubes. Generative hyphae hyaline, thick-walled, occasionally branched, subparallel along the tubes, 3–5 μm in diameter. Cystidia and cystidioles absent; basidia long clavate to pyriform, with four sterigmata and a basal clamp connection, 15–18×5–6 μm; basidioles abundant (hymenia dominant by basidioles), in shape similar to basidia, but slightly smaller. Hyphal structure. Hyphal system monomitic; generative hyphae thick-walled, bearing clamp connections, hyphae frequently branched from clamp connections, branched hyphae mostly H-, W- or Y-shaped; all hyphae usually encrusted with crystals, IKI–, CB–; hyphae swollen in KOH. Subiculum. Generative hyphae hyaline, thick-walled, frequently branched, interwoven, 4–6 μm in diameter. Rot type. A white rot.
Index Fungorum number: IF809343