Tremella salmonea X.Z. Liu & F.Y. Bai

Zhao, Ying, Liu, Xin-zhan & Bai, Feng-yan, 2019, Four new species of Tremella (Tremellales, Basidiomycota) based on morphology and DNA sequence data, MycoKeys 47, pp. 75-95 : 83-85

Tremella salmonea X.Z. Liu & F.Y. Bai sp. nov. Figures 3, 6

Type.

CHINA. Guangxi Province, Hechi city, Luocheng county, Jiuwan Mountain National Nature Reserve, 108°48'E, 25°19'N, G.J. Li, H.S. Ma, Z.L. Lin & M.Z. Zhang, 7 August 2017, GX20172637 (HMAS 279588).

Etymology.

Salmonea refers to the colour of the basidioma.

Description.

Basidiomata small, gyrose to cerebriform, 0.6-1.0 cm in diameter, firm gelatinous and thick, pale orange when fresh, yellow orange when dry, flat on the substrate. Hyphae smooth, thin-walled, slender, 2.0-3.5 μm in diameter, often with clamp connections. Haustoria rare, small, globose or subglobose, 2.0-4.0 μm in diameter, with single hyphae. Hyphidia rare, smooth, thin-walled, 2.0-4.0 μm, branched. Probasidial initials mostly subglobose to globose, sometimes broadly ellipsoid. Basidia, when mature, subglobose to globose, four-celled, occasionally two-celled, thin-walled, 31.0-38.0 μm × 29.0-37.0 μm, with longitudinally cruciate-septate, without stalk-like base; sterigmata up to 110.0 μm long, not swollen at apex. Basidiospores globose to subglobose, 16.0-22.0 μm × 15-20.0 μm, L = 18.3 ± 1.3 μm, W = 17.8 ± 1.4 μm, Q = 0.9-1.3 (n = 25), with a distinct apiculus. Conidia present, ellipsoid, fusiform to cylindrical, 8.0-17.0 μm × 2.0-5.0 μm, L = 10.7 ± 2.2 μm, W = 3.5 ± 0.5 μm, Q = 2-5.8 (n = 40), hyaline, clamped, arranged in cluster. Terminally and laterally swollen cells appearing abundant in the subhymenium, citriniform, pyriform or broadly ellipsoid, 9.0-20.0 μm × 5.6-13.0 μm, L = 14.2 ± 2.8 μm, W = 8.8 ± 1.8 μm, Q = 1.1-2.8 (n = 40).

Habitat.

On wood of deciduous tree, in forest dominated by Rosaceae , Moraceae , Lauraceae , and Theaceae .

Notes.

Only one specimen representing T. salmonea formed a distinct clade closely related to T. taiwanensis with 96.8%-98.3% sequence identities in D1/D2 domain and 95.4%-96.6% in ITS region, respectively. The affinity of T. salmonea to T. taiwanensis lacked high support by the coalescent-based method (Fig. 1). Tremella salmonea differs from T. taiwanensis in its larger basidia (31.0-38.0 μm × 29.0-37.0 μm in T. salmonea vs 23.0-29.0 μm × 22.0-27.0 μm in T. taiwanensis ) and basidiospores (16.0-22.0 μm × 15.0-20.0 μm in T. salmonea vs 14.0-18.0 μm ×14.0– 20.0 μm in T. taiwanensis ). In addition, hyphae-like conidiogenous cells and dikaryotic conidia were observed in T. salmonea compared to monokaryotic conidia produced from apex of sterigmata ( Chen 1998). Swollen cells were located in the hymenium in T. salmonea whereas they were absent in T. taiwanensis ( Chen 1998).