Basionym Name:Didymium costatum Fr., Syst. mycol. (Lundae) 3(1): 118 (1829)
Homotypic synonyms:Didymium squamulosum var. costatum (Fr.) Berl., in Berlese, De Toni & Fischer, Syll. fung. (Abellini) 7(1): 378 (1888)