Blastosporium persicolor Z. F. Yu & H. Zheng

Zheng, Hua, Zhang, ZhenNa, Wen, ZhiJia, F. Castaneda-Ruiz, Rafael & ZeFen Yu,, 2019, Blastosporiumpersicolor gen. et sp. nov., a new helotialean fungus, MycoKeys 51, pp. 55-64 : 59-61

Blastosporium persicolor Z. F. Yu & H. Zheng sp. nov. Figure 2

Etymology.

Latin, persicolor, referring to the apricot colour of the colonies on PDA medium.

Description.

Colonies on CMA with 1-2 concentric rings slightly curled, entire at the margin, light orange-yellowish-pinkish colour. Reverse yellowish-orange. Mycelium partly superficial and partly immersed, composed of branched, septate, smooth-walled, creeping, 2.0-3.3 μm wide hyphae. Conidiophores macronematous or semi- macronematous, mononematous, erect or prostrate, straight or flexuous, unbranched or slightly branched, hyaline, smooth-walled, 35-14.4 × 1.8-3.5 μm. Conidiogenous cells mostly monoblastic, sometime polyblastic after several sympodial elongations, integrated or discrete, terminal or intercalary, 7.0 –13.1× 2.6-3.3 μm, clavate or cylindrical, with a distinct or inconspicuous denticle at the conidiogenous loci. Conidia solitary or blastocatenate, acrogenous, obovoid, oblong, ellipsoidal, subcylindrical, allantoid, broad fusiform to irregular, slightly attenuated, truncate at the base or at the ends, unicellular, smooth, hyaline, 5-8 × 2.3-4.1 μm. Sexual form unknown.

Culture characteristics.

(in darkness, at 25 °C after 10 d). Colonies attaining 1.5-1.7 cm diam. on PDA, 1.0-1.2 cm diam. on SNA, 1.5-1.7 cm on CMA. On PDA, colonies plicated, orange, reverse pale yellow, margin smooth and entire; sporulation abundant. On SNA, colonies flat, white to cream-coloured, flocculent, reverse white, growing slowly, sporulation abundant. The fungus does not grow at 35 °C on PDA, CMA and SNA.

Type.

CHINA. Xiamen, Fujian Province, 24°33'9.6"N, 117°55'7.4"E, 23 m alt., from mildewed tobacco ( Nicotiana tabacum L.) leaves, June 2018, Z.N. Zhang (dried slide YMFT 1.05546, holotype; ex-type YMF 1.05546).