Cerrena caulinicystidiata T. Cao, F. Wu & H. S. Yuan sp. nov.

Figs 3, 4

Holotype.

China • Zhejiang Province, Hangzhou, Xiaoshan District, Yangjingwu Forest Park; 30 ° 4 ' 1 " N, 120 ° 19 ' 35 " E; 134 m a. s. l.; 27 Mar. 2023; on fallen angiosperm branch; F. Wu leg., Wu 661 (BJFC 040654).

Etymology.

Caulinicystidiata (Lat.): Refers to the cystidia with a tapering base.

Description.

Basidiocarps. Annual, resupinate, sometimes effused-reflexed, continuous, easily separable, without special odor or taste when fresh, corky when dry, up to 10 cm long, 3 cm wide and 0.5 mm thick. Pore surface greyish orange to brownish orange; pores irregular, 3–8 per mm, partly split up to 2 mm long; dissepiments thin. Sterile margin finely fimbriated. Subiculum very thin, yellowish white, ca. 0.5 mm thick, a very thin brownish red crust present in the bottom next to wood. Tubes concolorous with pore surface, corky, 0.5–1 mm long.

Hyphal structure. Hyphal system trimitic, generative hyphae with clamp connections; skeletal and binding hyphae CB +, IKI –; tissues unchanged in KOH.

Subiculum. Generative hyphae thin- to slightly thick-walled, hyaline, clamped, frequently branched, 2–5 µm in diam; skeletal hyphae dominant, thick-walled to subsolid, unbranched, interwoven, 2.5–6 µm in diam; binding hyphae hyaline, thick-walled to subsolid, tortuose, moderately branched, 1.5–2.5 μm diam. The thin crust made up of subsolid, brownish and strongly agglutinated hyphae.

Tubes. Generative hyphae infrequent, hyaline, thin- to slightly thick-walled, clamped, rarely branched, 2–3 µm diam; skeletal hyphae dominant, hyaline, thick-walled to subsolid, rarely branched, sometimes with septate, interwoven, 2–4 µm in diam; binding hyphae rare. Cystidia clavate to pyriform to ventricose, mostly thin-walled, occasionally thick-walled, smooth, 13–20 × 6–12 µm; encrusted cystidia numerous, clavate, originated from and tightly embedded in trama, 10–25 × 7–15 µm (with encrustation). Basidia short clavate, with four sterigmata and a basal clamp, 8–11 × 4–5 µm, basidioles in shape similar to basidia, but slightly smaller.

Basidiospores. Basidiospores broadly-ellipsoid to ovoid, hyaline, thin-walled, smooth, CB –, IKI –, (3 –) 3.2–4.5 (– 4.8) × (2.5 –) 2.8–3.5 (– 3.9) µm, L = 3.94 µm, W = 2.84 µm, Q = 1.38–1.44 (n = 60 / 2).

Additional specimens examined

(paratypes). Vietnam • Lam dong Province (Lat.), Lac Duong District, Bidoup Nui Ba National Park; 12 ° 11 ' 8 " N, 108 ° 40 ' 41 " E; 1495 m a. s. l.; 15 Oct. 2017; on fallen angiosperm branch; H. S. Yuan leg., Yuan 12666 (IFP 019379), Yuan 12664 (IFP 019378).