46 Asplenium ruta-muraria L.

This rather variable species occurs in Eurasia and N. America. In N. America it is represented by subsp. cryptolepis Claus. & Wahl. The subsp. dolomiticum Lovis & Reichst., endemic to Europe (the Dolomites), is not taken into consideration here (cf. Atlas Fl. Eur. 1/1972, map 96). The species s. lat. belongs to the circumpolar plants (Hultén, Circumpol. I, p. 164 and map 156).