Chaetophoma Cooke, Grevillea 7(no. 41): 25 (1878).
Index Fungorum number: IF 7582; Facesoffungi number: FoF 07149, 12 morphological species (Species Fungorum 2022), no molecular data available.
Saprobic on the host plant in terrestrial habitat. Sexual morph: Unknown. Asexual morph: Conidiomata dark brown, pycnidial, scattered to gregarious, superficial, globose, unilocular, glabrous. Ostiole absent. Conidiomatal wall composed of thick-walled, brown to hyaline cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells hyaline, enteroblastic, phialidic, ampulliform to doliiform, determinate, smooth-walled, with a minute apical channel and collarette. Conidia hyaline, cylindrical, unicellular, smooth-walled (adapted from Sutton 1980 and Wijayawardene et al. 2016).
Type species: Chaetophoma quercifolia Cooke
Notes: Chaetophoma is characterised by dark brown, pycnidial, scattered to gregarious conidiomata, hyaline, enteroblastic, phialidic, ampulliform to doliiform conidiogenous cells and hyaline, cylindrical, unicellular, smooth-walled conidia. Chaetophoma resembles Aposphaeria and Asteromella in having similar conidiomatal and conidial morphology. Chaetophoma differs from Aposphaeria and Asteromella in lacking conidiophores while they are present in Aposphaeria and Asteromella (Sutton 1980). In the phylogenetic analysis of De Gruyter et al. (2009) based on LSU and SSU sequence data, Chaetophoma grouped in Pleosporales. Zhang et al. (2012b) reported that Byssothecium (Massarinaceae, Pleosporales) has a chaetophoma-like asexual morph. Molecular data is lacking for Chaetophoma hence, the taxonomic placement of the genus is uncertain.