Peniophorella crassibasidiata K. Y. Luo, Yuan Yuan & Y. C. Dai sp. nov.

Figs 5, 6

Holotype.

China • Guangdong Province, Zhaoqing, Dinghu District, Dinghushan National Nature Reserve. GPS coordinates: 23.159571°N, 112.538344°E; elevation: 51 m a. s. l. On a fallen branch of Pinus massoniana, 8 July 2025, Yuan 3208 (BJFC 062754).

Etymology.

Crassibasidiata (Lat.), crassi- = thick, basidiata = basidia, referring to the thick-walled basidia of this species.

Description.

Basidiomata annual, resupinate, adnate, loosely attached, but not easily separable from substratum, soft coriaceous, without odor and taste when fresh, white when fresh, white to cream upon drying, up to 14 cm long, 1.5 cm wide, and 200 µm thick at center. Hymenophoral surface smooth; margin distinct, thin, white, up to 2 mm long.

Hyphal structure: Hyphal system monomitic; generative hyphae with clamp connections, thick-walled with a wide lumen, occasionally branched, flexuous, loosely interwoven, 2–4 μm in diameter, IKI –, CB –; tissues unchanged in KOH.

Hymenium: Cystidia of three types: (1) stephanocysts infrequent, with some oily contents, hyaline, thin-walled, 9–11 × 6–7 μm; (2) fusiform cystidia frequent, hyaline, thick-walled, 22–25 × 7–9 μm; (3) subulate cystidia frequent, sometimes with oily contents, hyaline, thick-walled, 20–50 × 6–10 μm. Cystidioles absent. Nubbly crystals abundant. Basidia barrel-shaped to subclavate, colorless, thick-walled, smooth, with four sterigmata and a basal clamp connection, 12–22 × 5–9 μm. Basidioles similar in shape to basidia, but smaller.

Basidiospores: cylindrical, hyaline, thin-walled, smooth, occasionally with two oil drops or contents, IKI –, CB –, (8 –) 8.4–12.4 (– 12.6) × (3 –) 3.1–4.2 (– 4.4) µm, L = 10.21 µm, W = 3.67 µm, Q = 2.78 (n = 30 / 1).

Type of rot.

White rot.