Asterostomella Speg., Anal. Soc. cient. argent. 22(4): 198 (1886).
Index Fungorum number: IF 7271; Facesoffungi number: FoF 06730, 87 morphological species (Species Fungorum 2022), 1 species with molecular data.
Leaf parasites. Asexual morph: Mycelium ectophytic, appressoria lateral, setae absent. Pycnothyria orbicular with radiating cells, astomatous, dehisce stellately at the center; pycnothyriospores ovate, pyriform, brown. Sexual morph: Unknown (Adapted from Hosagoudar 2012).
Type species: Asterostomella paraguayensis Speg.
Notes: Asterostomella was introduced by Spegazzini (1886) with A. paraguayensis as type species. Asterostomella is characterized by ectophytic mycelium, orbicular pycnothyria with radiating cells and ovate, pyriform, brown pycnothyriospores. Asterostomella is a distinct genus in Asterinaceae. Several authors added new species to Asterostomella (Petrak and Ciferri 1932; Doidge 1942; Viégas 1945; Batista and Ciferri 1959; Rao and Anahosur 1972; Singh et al. 1982; Hosagouder and Goos 1994; Hosagouder et al. 2007; Hosagouder et al. 2014; Sabeena et al. 2018). Species delineation in Asterostomella has been done based on fruiting body diameter and conidial sizes (Reynolds and Gilbert 2005). Hyde et al. (2020) confirmed the placement of Asterostomella in Asterinaceae based on phylogenetic analysis of LSU and SSU sequence data. Molecular data is available for only one species A. grewiae (LSU, SSU) in Genbank. Fresh collections and more taxa with DNA sequence data are needed to confirm the taxonomic placement of the genus.