CRYPTOGAMS VASCULARES — PROFESSOR BAYLEY BALFOUR. 327 



5. PTERIS. 



Pteris, Linn. Gen. n. 780 ; Hook, and Baker Syn. EL ed. 2 (1874), 153. 

 A large cosmopolitan genus. 



1. P. longifolia, Linn. Sp. 1531 ; Hook, and Baker, Syn. fil. ed. 2 (1874), 

 153 ; Bedd. Ferns South Ind. t. 33 ; Kuhn in Ber. Deut. Bot. Ges. i. (1883), 

 239. 



Socotra. Very common. B.C.S. n. 156. Schweinf. nn. 545, 775. 

 Kuhn {loc. cit.) gives n. 589 as number of one of Schweinfurth's specimens. 

 We do not have it from him under that number. 



Distrib. Common tropical and warm temperate fern. 



2. P. quadriaurita, Retz. Obs. vi. 38 ; Hook, and Baker, Syn. Fil. ed. 2 

 (1874), 158; Hook. Sp. Fil. ii. 179, t. 134, B; Bedel. Ferns South Ind. t. 31. 



P. hiaurita, Linn. var. repandula, Kuhn in v. d. Decken Eeisen iii. 3. 20, and in Ber. Deut. Bot. 

 Ges. i. (1883), 239 (= P. repandula, Link Fil. Sp. Berol. 56). 



Socotra. Not uncommon on the Haghier range. .B.C.S. n. 450. 

 Schweinf. n. 655. Kuhn gives 665 as Schweinfurth's number. Our specimen 

 from him is number 655. 



Distrib. Common in tropical and warm temperate regions round the 

 world. 



6. CEEATOPTEEIS. 



Ceratopteris, Brong. Bull. Soc. Philom. (1821), 184, c. ic. ; Hook, and Baker Syn. Fil. ed. 2 

 (1874), 174. 



An anomalous monotypic genus inhabiting still fresh waters in the tropics. 



C. thalictroid.es, Brong. loc. cit.; Hook, and Baker, loc. cit.; Hook. Sp. Fil. 

 ii. 235 ; Bedd. Ferns South Ind. t. 75 ; Kuhn in Ber. Deut. Bot. Ges. i. (1883), 

 240. 



Socotra. In streams near Tamarida. B.C.S. n. 77. Katheng. Schweinf. 

 n. 679. 



Distrib. Of the genus. 



7. ASPLENIUM. 

 Aspknium, Linn. Gen. n. 783 ; Hook, and Baker Syn. Fil. ed. 2 (1874), 190. 



An extensive cosmopolitan genus having three representatives in Socotra; 

 of which two are widely dispersed in the tropics, and the other is endemic. 



1. A. Trichomanes, Linn. Sp. 1540 ; Hook, and Baker Syn. Fil. ed. 2 

 (1874), 196 ; Hook. Brit. Ferns t. 29. 



Socotra. On the Haghier hills south of Tamarida. B.C.S. n. 444 



Distrib. All over the world. 



The Socotran plant has pinnules somewhat more distant than is typical. 



