Basionym Name:Lophiostoma gregarium Fuckel, Jb. nassau. Ver. Naturk. 23-24: 158 (1870)
Homotypic synonyms:Lophidium gregarium (Fuckel) Sacc., Michelia 1(no. 3): 340 (1878)Mytilostoma gregarium (Fuckel) P. Karst., Meddn Soc. Fauna Flora fenn. 5: 50 (1879)Platystomum gregarium (Fuckel) Trevis., Bull. Soc. R. Bot. Belg. 16: 16 (1877)