Nom:		Rhizocarpon calcareum forma excentricum Th.Fr., Lichenographia Scandinavica 1 (1874) page 632
Basionyme:		Lecidea petraea var. excentrica Ach.
Condition:		Forma, ñ
Position taxonomique:		Rhizocarpon calcareum (Ach.) Anzi [Espèce] Rhizocarpon Ramond ex DC. [Genre] Rhizocarpaceae M. Choisy ex Hafellner [Famille] Rhizocarpales Miądl. et al. [Ordre] Lecanoromycetidae P.M. Kirk, P.F. Cannon, J.C. David & Stalpers ex Miądl., Lutzoni & Lumbsch [Sous-classe] Lecanoromycetes O.E. Erikss. & Winka [Classe] Pezizomycotina O.E. Erikss. & Winka [Sous-embranchement / Sous-phylum] Ascomycota Caval.-Sm. [Embranchement / Phylum] Fungi R.T. Moore [Royaume]
L'Information des catalogues:		Zahlbruckner, Catalogus Universalis Lichenum 4: 358
Cybertruffle Resources:		Cyberliber Cumulative Index [English language only]
Liens:		Fungal Databases [Systematic Botany and Mycology, USDA] Genbank Google images IMI [CABI Fungus Dried Reference Collection] Landcare [New Zealand] New York Botanic Garden [Virtual Fungus Dried Reference Collection]