Microdochium sp. indet.

Huang, Shengting, Xia, Jiwen, Zhang, Xiuguo, Sun, Wenxiu & Li, Zhuang, 2020, Two new species of Microdochium from Indocalamus longiauritus in south-western China, MycoKeys 72, pp. 93-108 : 93

Microdochium sp. indet. Figure 4

Description.

Colonies on PDA attaining 73.9-80.4 mm in diameter after 15 days, felty to cottony, flat, margin entire or dentate, white, aerial mycelium abundant. Mycelium superficial, hyphae hyaline, septate, branched, smooth-walled. Reverse white to pale yellow, with yellow pigment produced with aging. Aerial hyphae aggregated to form numerous chlamydospores on agar surface. Chlamydospores thick-walled, terminal or intercalary, more frequently arranged in chains than clusters. Conidiophores not observed. Colonies on OA attaining 79.9-81.7 mm in diameter after 15 days, fluffy, margin entire, white. Reverse white. Colonies on MEA attaining 73.2-78.4 mm in diameter after 15 days, flat, with pale pink inconspicuous concentric circle near the centre, margin entire and white, aerial mycelium abundant.

Material examined.

China, Yunnan Province: Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, on diseased leaves of Indocalamus longiauritus . 16 April 2019, S.T. Huang, HSAUP1017, living culture SAUCC1017.

Note.

Strain SAUCC1017 failed to produce conidia and lacks a complete morphological description. It formed a conspicuous independent lineage from other Microdochium species in the tree. ITS sequence BLASTn search of SAUCC1017 showed many different species with 97% identity. BLASTn searches with LSU (GenBank MH869857) sequences result in 99% identity with M. bolleyi (CBS 172.63) and TUB2 (GenBank AB625368) sequences result in 99% identity with Xylaria cubensis (strain BCC 18758). Thus, here we listed it as an unidentified species.

Figures

Figure 4. Microdochium sp. (SAUCC 1017) a leaves of host plant b colony overview c-e surface of colony after 15 days on PDA (c) OA (d) MEA (e) f-h reverse of colony after 15 days on PDA (f) OA (g) MEA (h) i-k chlamydospores. Scale bars: 10 μm (i-k).