47 Ceterach officinarum DC.

This species s. lat. occurs mainly in W., C. and S. Europe, N. Africa and W. Asia. It includes subsp. bivalens D. E. Mayer in SE. Europe (cf. Atlas Fl. Eur. 1/1972, map 100). Outside the map area it occurs on the Cape Verde Islands and, although doubtfully, in Ethiopia and S. Africa. For the total distribution see Meusel et al. 1965, map p. 14, and Pichi-Sermolli in Lav. Soc. ltal. Biogeogr., N.S., 1/1970, map p. 104.