Two new asexual genera and six new asexual species in the family Microthyriaceae (Dothideomycetes, Ascomycota) from China Author Qiao, Min Laboratory for Conservation and Utilization of Bio-resources, Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming, Yunnan, 650091, China Author Zheng, Hua Laboratory for Conservation and Utilization of Bio-resources, Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming, Yunnan, 650091, China & School of Life Sciences, Yunnan University, Kunming, Yunnan, 650091, China Author Guo, Ji-Shu Laboratory for Conservation and Utilization of Bio-resources, Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming, Yunnan, 650091, China & School of Life Sciences, Yunnan University, Kunming, Yunnan, 650091, China Author Castaneda-Ruiz, Rafael F. https://orcid.org/0000-0003-0063-3265 Instituto de Investigaciones Fundamentales en Agricultura Tropical " Alejandro de Humboldt " (INIFAT), 17200, La Habana, Cuba Author Xu, Jian-Ping Laboratory for Conservation and Utilization of Bio-resources, Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming, Yunnan, 650091, China & Department of Biology, McMaster University, Hamilton, Ontario, L 8 S 4 K 1, Canada Author Peng, Jie Laboratory for Conservation and Utilization of Bio-resources, Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming, Yunnan, 650091, China & School of Life Sciences, Yunnan University, Kunming, Yunnan, 650091, China Author Zhang, Ke-Qin Laboratory for Conservation and Utilization of Bio-resources, Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming, Yunnan, 650091, China Author Yu, Ze-Fen Laboratory for Conservation and Utilization of Bio-resources, Key Laboratory for Microbial Resources of the Ministry of Education, Yunnan University, Kunming, Yunnan, 650091, China zfyu2021@163.com text MycoKeys 2021 2021-11-29 85 1 30 http://dx.doi.org/10.3897/mycokeys.85.70829 journal article http://dx.doi.org/10.3897/mycokeys.85.70829 1314-4049-85-1 F28559203A3D5CC7B888A4C2892F7880 Microthyriaceae Sacc., Syll. fung. (Abellini) 2: 658 (1883). Description. Hyde et al. 2013 . Type genus. Microthyrium Desm., Annls Sci. Nat., Bot., ser . 2 15: 137 (1841). Notes. Microthyriales only contains a single family Microthyriaceae , based on morphology and phylogeny. Currently, eleven genera are accepted in Microthyriaceae , including three asexual genera ( Hongsanan et al. 2020 ; Wijayawardene et al. 2020 ). The asexual morph of this family is characterised by having micronematous or macronematous, unbranched or branched, septate conidiophores, mono- to polyblastic, determinate or sympodial, clavate, subcylindrical, ampulliform or ovoid conidiogenous cells and solitary or in branched chains, acrogenous or acropleurogenous, aseptate to multi-septate conidia. In this study, we erected two new asexual genera, Antidactylaria and Isthmomyces and recognised six new asexual species in Microthyriaceae , based on DNA sequences at two gene fragments. In addition, two new combinations are proposed in Microthyriaceae combined morphology and phylogeny.