Tremella subfibulifera Alvarenga, F. Wu, L.F. Fan & Y.C. Dai, 2021

Fan, Long-Fei, Alvarenga, Renato Lucio Mendes, Gibertoni, Tatiana Baptista, Wu, Fang & Dai, Yu-Cheng, 2021, Four new species in the Tremella fibulifera complex (Tremellales, Basidiomycota), MycoKeys 82, pp. 33-56 : 33

Tremella subfibulifera Alvarenga, F. Wu, L.F. Fan & Y.C. Dai sp. nov.

Figs 3F , 9

Holotype.

Brazil. Pernambuco, Recife, Jardim Botânico do Recife, on angiosperm wood, 17 June 2016, R. L. M. Alvarenga 334 (URM).

Etymology.

Refers to the species being similar to Tremella fibulifera .

Basidioma.

Sessile, when fresh gelatinous, pale white, foliose to irregularly cerebriform, with undulate lobes, up to 3.0 cm long, 2.0 cm broad and 1.0 cm high from base, becoming firmly gelatinous and pale yellowish when dry, broadly attached to substratum.

Internal features.

Hyphae hyaline, smooth, slightly thick-walled, 2.0-4.0 μm in diameter, branched, interwoven, with abundant clamp connections, clamp complexes and anastomoses; hyphidia, swollen cells, vesicles and haustoria absent; mature basidia thin-walled, subglobose to broadly ellipsoid, with a basal clamp connection, (14.0-)14.4-20.3(-21.0) × (9.0-)12.8-16.3(-17.8) μm, L = 17.63 µm, W = 15.05 µm, Q = 1.17 (n = 30/1), sometimes their width greater than length, usually longitudinally or obliquely septate, 2-4-celled, with obvious oil drops; mature sterigmata often collapsed, juvenile sterigmata up to 15.0 µm long, 2.0-4.0 µm in diameter, slightly protuberant at apex; probasidia thin-walled, clavate to ellipsoid, guttulate, proliferating from terminal hyphae; basidiospores hyaline, thin-walled, ellipsoid apiculate, with oil drops, (5.0-)5.4-9.8(-10.0) × (4.0-)4.2-6.0(-6.4) μm, L = 8.0 µm, W = 5.3 µm, Q = 1.50 (n = 30/1); conidia massively present, originating from umbelliform conidiophores, hyaline, thin-walled, variously shaped, ellipsoid, fusiform to cylindrical, 2.0-3.0 × 0.5-1.0 μm.

Notes.

Tremella subfibulifera nested in the clade of the T. fibulifera complex, and formed an independent lineage. It resembles T. fibulifera s.s., but T. fibulifera s.s. has larger basidiospores (7.0-10.0 × 6.0-7.0 μm vs. 5.4-9.8 × 4.2-6.0 μm) and the presence of branched hyphidia (Table 3 ). In addition, T. subfibulifera are different from T. australe and T. fibulifera s.s. by 6.19% and 7.85% sequence differences in the ITS sequences and 2.23% and 2.10% in the partial nLSU sequences respectively.

Figures

Figure 3. Basidioma A Tremella fibulifera (Alvarenga 471) B T. australe (Wu 154) C T. guangxiensis (Wu 3) D T. latispora (Dai 17568) E T. " Tremella neofibulifera " (Wu 244) F T. subfibulifera (Alvarenga 334). Scale bars: 1 cm (A-F).

Figure 9. Microscopic structures of Tremella subfibulifera (Alvarenga 334) A basidiospores and secondary spores B germination tubes of basidiospores C conidia and conidiophores D-F basidia and probasidia G hyphae with clamp connections and clamp complexes H a section of hymenium. Scale bars: 10 μm (A-H).