Alternariaster Simmons, CBS Diversity Ser. (Utrecht) 6: 667 (2007).

MycoBank number: MB 505049; Index Fungorum number: IF 505049; Facesoffungi number: FoF 01154; 4 morphological species (Species Fungorum 2020), 4 species with molecular data (Hyde et al. 2017).

Type speciesAlternariaster helianthi (Hansf.) E.G. Simmons, CBS Diversity Ser. (Utrecht) 6: 667 (2007).

Helminthosporium helianthi Hansf., Proc. Linn. Soc. London 155: 49 (1943) [1942-43].

NotesAlternariaster, typified by Alternaria helianthi was introduced in Simmons (2007) to accommodate a fungal species that cause leaf spots on Helianthus annuus (sunflower). Alternariaster centaureae-diffusae has long filiform, multi-septate ascospores (Ariyawansa et al. 2015b). The asexual morph was segregated from alternaria-like dematiaceous hyphomycetous based on morphology and phylogenetic support (Woudenberg et al. 2013, Hyde et al. 2017, Wijayawardene et al. 2018).