Basionym Name:Dictydium umbilicatum var. laxum Berk. & M.A. Curtis, Grevillea 2: 67 (1873)
Homotypic synonyms:Dictydium cernuum var. laxum (Berk. & M.A. Curtis) Berl., in Berlese, De Toni & Fischer, Syll. fung. (Abellini) 7(1): 411 (1888)