Gerronema Singer, Mycologia 43(5): 599 (1951).
Index Fungorum number: IF 17648; MycoBank number: MB 17648
Gerronema is a minor genus of lignicolous agaric and is distributed worldwide (Singer 1986). There are 66 epithets (excluding synonyms) listed in the Index Fungorum (2021). Gerronema. melanomphax Singer is the specific type species. Historically, different circumscriptions of Gerronema based on pigmentations established by Singer (1964) and Bigelow (1970) have been problematic. Subsequently, Redhead (1986) and Norvell et al. (1994) restricted the delimitation of Gerromena and characterized its descriptive features as elastic to fleshy, omphalinoid to clitocyboid basidiomata, white spore print, smooth, thinwalled, inamyloid basidiospores, cutis pileipellis often with intracellular pigment, sarcodimitics trama tissue and lignicolous habit. This circumscription correlates with the molecular phylogenetic analysis of the combined nrITS and nrLSU dataset and revealed that Gerronema is monophyletic and forms a clade with Megacollybia and Trogia in Hydropoid calde (Antonín et al. 2019).
Species