Sessile, when fresh soft gelatinous, creamy-white to pale yellowish, irregularly cerebriform or slightly foliose, with undulate lobes, up to 4.5 cm long, 2.0 cm broad and 2.5 cm high from base, becoming firmly gelatinous and invisible yellowish when dry, broadly attached to substratum.

Hyphae hyaline, smooth thin- to slightly thick-walled, 2.0–6.0 µm in diameter, branched, interwoven, with abundant clamp connections, clamp complexes and anastomoses, slightly thick-walled hyphae usually present near to base of basidioma, sometimes swollen up to 8.5 μm; hyphidia hyaline, smooth, thin-walled, arranged in cluster, usually parallel; vesicles infrequent, thick-walled; swollen cells and haustoria absent; mature basidia thin-walled, ovoid to subglobose, with a basal clamp connection, 14.0–16.0 × 13.0–17.0 μm, L = 14.9 µm, W = 14.8 µm, Q = 1.01 (n = 30/1), sometimes their width greater than length, usually longitudinally septate, rarely obliquely septate, 2–4-celled, with obvious oil drops; sterigmata up to 70 μm long, 1.5–2.0 in diameter, slightly protuberant at apex; probasidia thin-walled, ellipsoid to subglobose, usually proliferating from terminal hyphae; basidiospores hyaline, thin-walled, ellipsoid to broadly ellipsoid, apiculate, with oil drops, 8.0–10.0 × 6.0–8.0 μm, L = 8.9 µm, W = 6.5 µm, Q = 1.37 (n = 30/1), germination by germ tubes or secondary spores; conidia absent.

China Jilin, Helong, Quanshuidong Forest Farm, on stump of Quercus, 15 July 2017, F. Wu 243 (BJFC031046); F. Wu 244 (BJFC031047); F. Wu 248 (BJFC031051).

Three specimens listed above from Northeast China together with LE303445 from Far East of Russia formed a distinct lineage closely related to T.guangxiensis in our phylogenies (Figs 1, 2). T.neofibulifera was originally described from Japan (Kobayasi 1939), and our studied East Asian samples have similar morphology to T.neofibulifera except bigger basidiospores (Table 3). We fail to loan the type of T.neofibulifera, and for the time being we treat our studied East Asia samples as T. “neofibulifera”. The current T. “neofibulifera” differs from other similar species of the Tremellafibulifera complex by the parallel hyphidia and the presence of vesicles. In addition, T. “neofibulifera” are different from T.guangxiensis, T.australe, T.subfibulifera and T.fibulifera s.s. by 3.15%, 5.25%, 7.14%, and 8.19% sequence differences in the ITS sequences and 2.04%, 1.32%, 3.18%, and 2.41% in the partial nLSU sequences respectively.