CHINA, Fujian Province, Ningde city, Gutian county, on the basidioma of Tremellafuciformis, July 2017, X.Z. Liu (holotype strain: CGMCC 2.5724^T, ex-holotype strain: CBS 15261^T).

Basidiomaticola refers to the species isolated from the basidioma of T.fuciformis.

Asexual morph: colonies yellowish, smooth, shiny, and slimy, with an entire margin. Pseudohyphae and hyphae are not formed on corn meal agar. Conidia hyaline, smooth, globose to subglobose, 3.0–6.0 × 2.5–5.0 μm, L = 4.8 ± 0.9 μm, W = 3.9 ± 0.8 μm, Q = 1.0–1.7 (n = 30). Ballistoconidia, globose to subglobose on CMA agar, 5.0–7.0 × 3.5–6.0 μm, L = 6.0 ± 0.6 μm, W = 5.1 ± 0. 6 μm (n = 30). The comparison of physiological properties between this new species and its related taxa were listed in Suppl. material 1. Sexual morph: undetermined.

CHINA, Fujian Province, on the basidioma of Tremellafuciformis, July 2017, X.Z. Liu, CGMCC 2.5725 = CBS 15262; Japan, isolated from Mori Ind. Co., Ltd, 1968, T. Suda, NBRC 8990 = CBS 8225.

Three strains representing T.basidiomaticola clustered in a well-supported clade that closely related to T.yokohamensis, T.flava, and T.fuciformis. TremellabasidiomaticolaCGMCC 2.5724^T differed from T.yokohamensis, T.flava, and T.fuciformis by 97.4%, 94.4%–95.1%, and 97.8%–98.1% sequence identities in D1/D2 domain and 96.3%–96.6%, 94.4%–95.7%, and 96.6%–97.5% sequence identities in ITS region. Physiologically, the ability to assimilate lactose, melibiose, raffinose, inulin, soluble starch, L-rhamnose, ethanol, glycerol, DL-lactic acid, and inositol were different between T.basidiomaticola and closely related taxa (Suppl. material 1: Table S1). Moreover, the novel species can grow in vitamin-free medium but not for its sister species.