Ceterach Ceterach, DC. Pleurosorus Fée Pleurosorus Pleurosorus, (Cosson) C. V. Morton

1. C. officinarum DC. View in CoL in Lam. & DC., Fl. Fr. ed. 3, 2: 566 (1805).

Leaves 3-25 cm, persistent, oblong; petiole short, as long as lamina, covered with scales; lamina greyish to dark green above, covered with light brown, overlapping scales beneath; leaf-segments alternate, ovate or oblong, 9-12 on each side, entire or crenate, rounded at the apex. Sori c. 2 mm. Mean spore-length 41-48 g. 2n = 144. Dry rocks and walls. W., S. & C. Europe, northwards to Scotland and S. Sweden, eastwards to Krym. All except Az Da Fa Fe Is N o Rs (N, B, C, W, E) Sb; only as naturalized alien in Po. A taxon from S.E. Europe, differing from 1 in chromosome number (2« = 72) and mean spore-length (32-39/0, has recently been described, as Asplénium javorkeanum , by G. Vida, Acta Bot. Acad. Sci. Hung. 9: 197 (1963).

3. Pleurosorus Fée 2

Rhizomes short, with narrow, dark scales. Petiole and lamina with long, pale hairs; lamina pinnate with lobed pinnae; veins repeatedly forked. Sori elongate along the small veins, without indusium.

1. P. hispanicus (Cosson) C. V. Morton View in CoL , Bull. Soc. Bot. Fr. 106: 233 (1959)

( Ceterach hispanicum (Cosson) Mett. ).

Leaves 3- 8 cm, tufted; petiole and lamina about equal in length; pinnae 1 cm or less, rather distant, shortly stalked or subsessile, cuneate at the base, pinnatifid or lobed; each fertile pinna with 3-5 small, ovate or elliptical sori. 2n = 72. Shady places on calcareous mountains. N. W. & S. Spain. Hs. (A. Africa.)