Septonema Corda, Icon. fung. (Prague) 1: 9 (1837).
Index Fungorum number: IF 9888; Facesoffungi number: FoF 08108, 39 morphological species (Species Fungorum 2021), molecular data unavailable.
Saprobic on host. Asexual morph: Colonies minute to effuse, hairy or velvety, olivaceous grey, brown to blackish brown. Basal hyphae pale to brown, smooth, septate, branched, superficial and immersed in the substrate. Sterile setae absent. Conidiophores single or crowded, erect, unbranched or with short lateral branches, brown, septate, smooth. Conidiogenous cells polyblastic or monoblastic, cylindrical, integrated, terminal and intercalary at the main axis of the conidiophore and branches, or several of them situated at the apex, producing long branched acropetal chains of conidia. Conidia cylindrical to oblong or ellipsoidal to fusiform, grey-brown to olivaceous brown, with several transverse septa, dry, smooth, more or less thick-walled. Sexual morph: Unknown (Adapted from Holubová-Jechová 1978).
Type species: Septonema secedens Corda
Notes: Septonema was introduced by Corda (1837) with S. secedens as type species. Septonema is characterized by minute to effuse, hairy or velvety colonies, polyblastic or monoblastic conidiogenous cells and cylindrical to oblong or ellipsoidal to fusiform, grey-brown to olivaceous brown conidia with with several transverse septa. Since then, several species have been introduced in Septonema (Steven 1946; Subramaniam 1956; Borowska 1975; Holubová-Jechová 1978; Lunghini and Toscano 1997; Schubert and Braun 2007). Delgado et al. (2019) recently added S. lohmanii. Boehm et al. (2009), Hyde et al. (2013) and Wijayawardene et al. (2018) treated Septonema in Mytilinidiaceae but fresh collections are needed to confirm the taxonomic placement of the genus.