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Cladonia firma (Nyl.) Nyl. Bot. Zeitung (Berlin) 19: 352. 22 Nov 1861.
 Cladonia alcicornis var. firma Nyl. Syn. Meth. Lich. 1: 191. Apr 1860. Portugal, Algarve, Marim, 1951, C. N. Tavares
  Neotype H, Isoneotype B, KUO, LISU, UPS
  : Ahti, T. 1993. Names in current use in the Cladoniaceae (Lichen-forming Ascomycetes) in the ranks of genus to variety. In: Greuter, W. ( ed.). Regnum Veg. 28: 58-106.