Phanerochaete citrinorhizomorpha K. Y. Luo, Yuan Yuan, Y. C. Dai & Xin Zhang 2024, sp. nov.

Phanerochaete citrinorhizomorpha K. Y. Luo, Yuan Yuan, Y. C. Dai & Xin Zhang sp. nov. Figs 6, 7 Holotype. China • Zhejiang Province, Jinhua, Wuyi County, Xinzhai, Daozhi Village; on dead bamboo; 14. X. 2023; Y. C. Dai 26417 (BJFC 043967). Etymology. Citrinorhizomorpha (Lat.) refers to the new species having yellowish rhizomorphs. Description. Basidiomata annual, resupinate, adnate, soft coriaceous, without odor and taste when fresh, up to 7 cm long, 5 cm wide, 100–200 µm thick. Hymenial surfaces flesh-pink when juvenile, salmon to peach with age. Becoming purple in KOH. Sterile margins paler than hymenial surface, thinning out, usually with yellowish rhizomorphs, and up to 4 cm. Hyphal system monomitic, generative hyphae simple septate, IKI –, CB –; tissue unchanged in KOH. Subicular hyphae hyaline, thick-walled, up to 0.1 µm thick, simple septate, frequently branched at acute angles, interwoven, 2–6 µm in diameter. Subhymenial hyphae hyaline, thick-walled, 1.5–3 µm in diameter, encrusted with crystal granules. Cystidia mostly subulate with an obtuse apex, hyaline, thick-walled, up to 0.1 µm thick, with a simple septum at the base, usually encrusted with crystal granules, projecting above hymenium, projecting up to 17 µm above the hymenial layer, 18–36 × 4–6 µm; cystidioles absent. Basidia clavate, with four sterigmata and a basal simple septum, 12–17 × 4–6 µm; basidioles of similar shape to basidia, but smaller. Basidiospores ellipsoid, hyaline, thin-walled, smooth, usually with a medium guttule, IKI –, CB –, (3.3 –) 3.5–4.5 (– 4.9) × (1.8 –) 1.9–2.8 (– 3.2) µm, L = 3.94 μm, W = 2.37 μm, Q = 1.54–1.80 (n = 60 / 2). Type of rot. White rot. Additional specimen examined (paratype). China • Yunnan Province, Honghe, Jinping County, Fenshuiling Nature Reserve; on a fallen angiosperm branch; 18. VIII. 2019; Y. C. Dai 20753 (BJFC 032420).