cxLirr. FiLTCES. 463 



7. DAVALLIA, Smith. 



Sori always terminal on the veins, but often more or less 

 intramarginal ; in the South African species attached by the 

 sides as well as the base, leaving only the apex free. — Hook, 

 and Baker, Syn. Fil. p. 88. Microlepia and Davallia, Pappe 

 and Baivson, />. 24. 



The 4 South African species represent 3 subgenera ; 2, Eudavallia, with 

 coi'iaceous fronds and stems jointed at the base as in P oly podium ; 1, Mi- 

 crolepia, with ample decompound herbaceous fronds, membranous invohi- 

 cres and stipes continuous with the caudex ; and 1, Loxoscaphe, which has 

 tlie sori in lateral pouches, connects this tribe with Asplenieae through 

 Darea. 



8. CYSTOPTERIS, Bernh. 



Sori dorsal both as regards the veins and segments ; the in- 

 volucre an ovate, membranous scale, attached only by the base. 

 — Pappe and Bawson, p. 16; Hook, and Baker, p. 103. 



A small genus, principally found in the north temperate zone ; the single 

 South African species is one of the most cosmopolitan of plants. 



TeIBE 4. LlNDSATE^. 



Sori linear, placed along the very edge of the segments of 

 the frond, enclosed in a similarly- shaped involucre, composed 

 of 2 subequal valves. 



9. LINDSAYA, Dryand. 



The only genus. — Hook, and Baker, Syn. Fil. p. 104. Schi- 

 zolema, Pappe and Rawson, p. 25. 



One species, which is widely diflPused through the tropics of the Old 

 World, extends into Natal. — The typical Lindsayce have dimidiate papy- 

 raceous ultimate divisions and free venation, but in this the divisions are 

 equal-sided, and the veins anastomose copiously. 



Teibe 5. Pteride^. 



Sori quite marginal as regards the segments of the frond, 

 terminal on the veins, round or oblong or linear. Involucres 

 similar to the sori in shape and rolled over them or bearing 

 the sori on their lower surfaces. 



10. ADIANTUM, Linn. 



Involucres bearing the sori from their under surface, round 

 or oblong or linear. — Pappe and Eaicson, p. 32 ; Hook, and 

 Baker, Syn. Fil. p. 11^. 



Colour and texture of the frond usually bright green and papyraceous, the 

 veining more or less clearly fan-like, and the divisions often dimidiate. — In 



