CXLIII. FILICES. 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 Rawson, p. 24, 
The 4 South African species represent 3 subgenera; 2, Zudavallia, with 
coriaceous fronds and stems jointed at the base as in Polypodium ; 1, Mi- 
crolepia, with ample decompound herbaceous fronds, membranous involu- 
eres and stipes continuous with the caudex ; and 1, Loxoscaphe, which has 
poe sori in lateral pouches, connects this tribe with Aspleniee through 
area. 
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 Rawson, 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. 
Tripe 4. LInDSAYE®. 
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 diffused through the tropics of the Old 
World, extends into Natal.—The typical Lindsay@ have dimidiate papy- 
raceous ultimate divisions and free venation, but in this the divisions are 
equal-sided, and the veins anastomose copiously. 
Tripe 5. PrEeRIpEm. 
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 Rawson, p. 32; Hook. and 
Baker, Syn. Fil. p. 118. 
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 
