Hypomyces tremellicola (Ellis & Everh.) Rogerson, Mem. N. Y. Bot. Gdn. 26(3): 20, 1976.

Zeng, Zhao-Qing, Zheng, Huan-Di, Wang, Xin-Cun, Wei, Sheng-Long & Zhuang, Wen-Ying, 2020, Ascomycetes from the Qilian Mountains, China - Hypocreales, MycoKeys 71, pp. 119-137 : 119

Hypomyces tremellicola (Ellis & Everh.) Rogerson, Mem. N. Y. Bot. Gdn. 26(3): 20, 1976.

Specimen examined.

China, Gansu Province, Zhangye, Minyue, on (?) Agaricus sp., August 2018, C.H. Dong & S.J. Li 12287 (HMAS 247843).

Sequences.

ITS (MT084414) and LSU (MT078664).

Description.

On MEA, colony radius 33 mm after 7d at 25 °C, velvet, surface white, reverse light brown; aerial hyphae white. On PDA, colony radius 20 mm after 7d at 25 °C, floccose, surface grey white, reverse light sienna; aerial hyphae white. Simple branches of aerial hyphae terminating in 1-2-verticillate conidiophores with terminal whorl of 2-4 phialides. Phialides subulate, tapering towards apex, smooth, 8-25 × 1.5-2 μm. Conidia ellipsoidal to rod-shaped, aseptate, hyaline, smooth, 2.5-8 × 1-3 μm. Chlamydospores globose, hyaline, smooth, 5-8 μm in diameter, rare ellipsoidal, 6-12 × 5-10 μm, formed singly or in chains in intercalary position.

Distribution.

Canada, China, Germany, New Zealand, The Netherlands, United States, Venezuela.

Notes.

Hypomyces tremellicola is a new record for China. This species was originally described as Hypocrea tremellicola Ellis & Everh. ( Ellis and Everhart 1892), and later transferred to Hypocreopsis P. Karst. ( Seaver 1910) and Nectriopsis Maire ( Gams and Zaayen 1982). Samuels (1976) redescribed the species and assigned it to Hypomyces . It usually grows on Crepidotus spp., and less frequently on Polyporus spp. and Pleurotus spp. The shape and size of conidia and chlamydospores of the Chinese material match well with the description provided by Zare and Gams (2019). Sequence comparisons showed that 4 bp and 1 bp divergences existed in ITS and 28S rDNA between the Chinese material (HMAS 247843) and a collection from Germany (CBS 441.65). We treat them as infraspecific variations.