Basionym Name:Collema tremelloides var. pichneum Ach., Syn. meth. lich. (Lund): 343 (1814)
Homotypic synonyms:Leptogium caesium var. pichneum (Ach.) Vain., Ann. Acad. Sci. fenn., Ser. A 15(no. 6): 40 (1921)Leptogium pichneum (Ach.) Nyl., Acta Soc. Sci. fenn. 26(no. 10): 3 (1900)Leptogium tremelloides var. pichneum (Ach.) Nyl., Lich. Nov. Zeland. (Paris): 10 (1888)