Scopuloides hainanensis Q. X. Guan, H. Zhao & Y. C. Dai sp. nov.

Figs 3 c, d, 6, 7

Holotype.

China • Hainan Province, National Park of Hainan Tropical Rainforest, Diaoluo Mountain, on fallen branch of Dacrydium pectinatum, 18.725211°N, 109.868396°E, elev. 927 m, 3 July 2025, Dai 37144 (BJFC 058403).

Etymology.

Hainanensis (Lat.) refers to the species collected from Hainan Province, China.

Description.

Basidiomata annual, resupinate, closely adnate, membranaceous, without odor or taste when fresh, difficult to separate from substrate, up to 15 cm long, 5 cm wide, 0.3 mm thick. Hymenial surface grandinioid, white to gray when fresh, turning to gray upon drying. Margin gradually thinning out, concolorous with the hymenial.

Hyphal system monomitic; generative hyphae with simple septa, colorless, thick-walled, branched, interwoven, 2.5–3.5 μm in diameter, IKI –, CB –; tissues unchanged in KOH. Lamprocystidia abundant, subulate to fusiform, colorless, thick-walled, 25–45 × 7.5–11 µm. Basidia clavate, with four sterigmata and a basal simple septum, 9–12 × 3–4 µm; basidioles numerous, in shape similar to basidia but smaller. Basidiospores subcylindrical to allantoid, colorless, thin-walled, smooth, IKI –, CB –, 3.4–4.4 × 1.6–2.1 µm, L = 3.89 µm, W = 1.81 µm, Q = 2.06–2.23 (n = 60 / 2).

Type of rot.

white rot.

Additional specimen examined

(paratype). China • Hainan Province, National Park of Hainan Tropical Rainforest, Diaoluo Mountain, on fallen angiosperm branch, 18.725211°N, 109.868396°E, elev. 927 m, 3 July 2025, Dai 37155 (BJFC 058414).