Grosmannia zekuensis R.L. Chang & Z.W. de Beer 2020
MycoBank MB 827337
Holotype: China: Qinghai province: Xianmi Forest Farm, from Bakerdania sp. in gallery of Ips nitidus on Picea crassifolia, 8 Aug. 2010, S. J. Taerum (PREM61579 – holotype (dried culture); CMW41876 = CBS141901 – extype culture).
Morphological description
Sexual morph not observed. Conidiophores macronematous, mononematous, erect, arising directly from the mycelium, (98–) 114–182 (− 269) μm long.
Rhizoids present. Stipes olivaceous, 2–4 septate, not constricted at septa, (67–) 73.5–125.5 (− 182) μm long; apical cells occasionally swollen at apex, (4–) 5–7.5 (− 10.5) μm wide; basal cells not swollen, (5.5–) 7–10 (− 11) μm wide. Conidiogenous apparatus (16–) 30.5–49 (− 67) μm long, excluding the conidial mass, with multiple series of cylindrical branches; primary branches olivaceous, smooth, cylindrical, not swollen at apex, aseptate, arrangement of primary branches was Type B—more than two branches, (7.5–) 10–16 (− 16) x (3–) 3.5–4.5 (− 5.5) μm; secondary branches light olivaceous, frequently swollen at apex, aseptate, (6–) 8–11 (− 12.5) x (2–) 2.5–4 (− 5) μm; tertiary branches light olivaceous, aseptate, (6–) 7–10 (− 11) x (2–) 2.5–3 (− 3) μm. Conidiogenous cells discrete, hyaline, 2–3 per branch, aseptate, cylindrical, tapering slightly at the apex, (6–) 8–12 (− 14.5) x (1.5–) 2–3 (− 3) μm. Conidia hyaline, aseptate, elliptical, (3.5–) 4–5.5 (− 8) x (2–) 2.5–3 (− 3.5) μm.
Culture characteristics: Colonies hyaline without asexual structures or dark brown when asexual structures form. Mycelium superficial on the agar. Optimal temperature for growth 25 °C. Some isolates grow faster, reaching
73.3 mm diam in 8 d at 25 °C and no growth at 30 °C and above. However, some isolates grow slowly and only reach 46.3 mm diam in 8 d and slow growth observed at 35 °C.
Habitat: From Bakerdania sp.
Distribution: In China.
GenBank Accession: ITS/ITS2-LSU: MH121683;BT: MH124485; EF: MH124546
Notes:
Reference: Runlei Chang1,2, Tuan A. Duong1, Stephen J. Taerum1 et al.
Morphological characters of asexual structure of Grosmannia zekuensis sp. nov. a Cultures on malt extract agar (MEA); b, d conidiogenous apparatus; c conidiophore; e conidia. Scale bars: 10 μm
