Basionym Name:Catapyrenium umbrinum Breuss, Linzer biol. Beitr. 22(1): 78 (1990)
Homotypic synonyms:Clavascidium umbrinum (Breuss) Breuss, Annln naturh. Mus. Wien, Ser. B, Bot. Zool. 98(Suppl.): 41 (1996)Placidium umbrinum (Breuss) M. Prieto & Breuss, Taxon 58(1): 196 (2009)