Dimorphiseta L. Lombard & P. W. Crous

Dimorphiseta L. Lombard & P. W. Crous Notes. The genus Dimorphiseta was introduced to place D. terrestris, a strain originally isolated from soil habit in USA by Lombard and Crous (2016), and three species are recognized in MycoBank (Accession date: March 10, 2025). Conidiomata of these species are superficial, oval to elongate or irregular in outline, sporodochial, stromatic, cupulate, scattered or gregarious, and are covered by an olivaceous green mucoid layer. Three distinct types of setae are present: type I – hyaline, thin-walled, flexuous to circinate, verrucose, tapering to an obtuse apice; type II – hyaline, thick-walled, septate, smooth, tapering to a sharp apice; type III – hyaline, thin-walled, straight, terminating in an obtuse apex. Conidiophores are irregular, macronematous and smooth-walled. Conidiogenous cells are hyaline, cylindrical, phialidic, smooth, with conspicuous collarettes while conidia are hyaline, cylindrical, fusiform, smooth, aseptate, funnel-shaped mucoid apical appendage (Lombard et al. 2016; Liang et al. 2019). The species of Dimorphiseta have been reported from China, Taiwan, and USA occurring on soil and also as saprobes in plant species belonging to Poaceae and Cannabaceae families (Lombard et al. 2016; Liang et al. 2019; Tennakoon et al. 2021).