Synonymy:
Collema asperellum Ach. [as 'asprellum'], Lich. Univ.: 629 (1810)
Lichen asperellus (Ach.) Wahlenb., Fl. lapp.: 441 (1812)
Lichen furvus * asperellum (Ach.) Lam., Encycl. Méth., Bot. Suppl. (Paris) 3(2): 414 (1813)
Patellaria asperella (Ach.) Spreng., Syst. veg., Edn 16 4(1): 268 (1827)
Toninia asperella (Ach.) A. Massal., Framm. Lichenogr.: 24 (1855)
Lecidea asperella (Ach.) Th. Fr. [as 'asprella'], Flora, Regensburg 40: 631 (1857)
Pterygium asperellum (Ach.) Nyl., Not. Sällsk. Fauna et Fl. Fenn. Förh., Ny Ser. 4(no. 1): 236 (1859) [1858-59]
Lecothecium asperellum (Ach.) Th. Fr., Nova Acta R. Soc. Scient. upsal., Ser. 3 3: 386 (1861) [1860]
Pannaria asperella (Ach.) Nyl., in Hue, Nouv. Arch. Mus. Hist. Nat., Paris, 3 sér. 3: 39 (1891)

Parmelia aspratilis Ach., in Weber & Mohr, Beitr. Naturk. 2: 152 (1810)
Placynthium aspratile (Ach.) Henssen, Canad. J. Bot. 41: 1699 (1963)

Position in classification:
Placynthium, Placynthiaceae, Peltigerales, Lecanoromycetidae, Lecanoromycetes, Ascomycota, Fungi

Note:
We aim to keep taxonomic opinions up to date, but errors or delays can occur. Please report them to our curator.