Basionym Name:Endocarpon cinereum var. cartilagineum Nyl., Bot. Notiser(10-11): 157 (1853)
Homotypic synonyms:Endocarpon cartilagineum (Nyl.) Arnold, Flora, Regensburg 53(30-31): 483 (1871)Endocarpon tephroides var. cartilagineum (Nyl.) Boistel, Nouv. Fl. Lich. (Paris): 98 (1896)Placidiopsis cartilagenea (Vain.) Vain., Acta Soc. Fauna Flora fenn. 49(no. 2): 23 (1921)