Exophiala yuxiensis Z.F. Yu & R.L. Lv, 2022

Lv, Ruili, Yang, Xiaoqian, Qiao, Min, Fang, Linlin, Li, Jianying & Yu, Zefen, 2022, Exophiala yunnanensis and Exophiala yuxiensis (Chaetothyriales, Herpotrichiellaceae), two new species of soil-inhabiting Exophiala from Yunnan Province, China, MycoKeys 94, pp. 109-124 : 109

Exophiala yuxiensis Z.F. Yu & R.L. Lv sp. nov.

Fig. 4

Etymology.

yuxiensis, pertaining to Yuxi, a city of Yunnan Province in China, from which the type was collected.

Description.

Colonies on CMA medium after 7 days with hyphae pale olivaceous-green, smooth, irregularly septate, thin-walled, branched, 1.5-3 µm wide, with lateral branches originating close to septa. Conidiogenous cells slightly differentiated from hyphae, arising from hyphal tips or lateral, terminal or intercalary, variable in shape, flask-shaped, ovoid to elongate, clavate, obtuse at the base, tapering towards inconspicuous annellate loci, 5.5-10.5 × 3-5 μm; annellated zones inconspicuous or occasionally finely fimbriate, often inserted on intercalary cells of hyphae. Conidia aseptate, ellipsoidal to cylindrical, 1-2 (mostly 2) bi-guttulate, smooth, pale olivaceous-green, 4.5-8 × 3.5-5 µm, without conspicuous scar.

Culture characteristics.

Colonies on PDA medium, at 25 °C, were slow-growing, mycelium immersed and partly superficial, umbonate, dense, powdery or velvety, dry, margin irregular, surface olivaceous-grey, reverse olivaceous-black, attaining 1 cm diam. in 4 days. Colonies on CMA medium were restricted, mycelium immersed and partly superficial, cottony, surface olivaceous-green, some floccose aerial hyphae in the centre, front distinct, reverse pale olivaceous-black, reaching 3 cm diam. in 5-7 days.

Type.

China. Yuxi City, Yunnan Province, isolated from soil of rocky desertification area, 24°44'N, 102°55'E, 1660 m altitude, Jul 2021, Z.F. Yu, preserved by lyophilisation (a metabolically-inactive state) in State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan (holotype YMFT 1.07354), ex-holotype live culture: YMF 1.07354; CGMCC 3.16094; GDMCC 3.726; JCM 39376 ).

Figures

Figure 4. Exophiala yuxiensis (YMFT 1.07354, holotype) A colony on PDA after 30 days B colony on CMA after 30 days C-E conidiogenous cells F conidia and budding cells. Scale bars: 3.2 cm (A, B), 10 µm (C-F).