38 
The Ferns of Sou fh Africa. 
Genus XI. — Lonchitis. Sori in the hollow between two 
lobes, reniform, or oblong, covered by the indusium. 
Veins anastomosing. 
Genus XII. — Hypolepis. Capsules covered by the indu- 
sium. Indusium membranous in texture, small, round, 
equal. Sori in the hollow between two lobes, or on the 
opposite edge of the frond. Sometimes also scattered 
along the edge. Veins free. 
Genus XIII. — Cheilanthes. Indusium roundish, not con- 
tinuous, formed of the edge of the frond, which is only 
partly turned back. Sori abundant — often crowded all 
round the edge of the frond, except at the sinus. 
Genus XIV. — Pell^ea. Indusium continuous, or sometimes 
imperfectly continuous, interrupted or roundish. Capsules 
produced on the frond under the indusium, in a wide line. 
Genus XV. — Pteris. Indusium continuous. Sori in the 
axil of the indusium, in a narrow line. 
Genus XVI. — Lomaria. Indusium continuous. Sori 
occupying the whole underside of the frond, except the 
mid-rib. Fertile pinnae narrower than the barren. 
**** Sori not marginal, but covered by a linear or oblong in- 
dusium, opening toward the mid-rib. 
Genus XVII. — Blechnum. Sori linear, parallel with the 
mid-rib. 
Genus XVIII. — Asplenium. Sori linear or oblong, placed 
obliquely between the mid-rib and the margin. 
Genus XIX. — Actiniopteris. Frond flabellate, with narrow 
segments. Sori submarginal, linear. 
***** Sori not marginal, but covered by a reniform or circular 
peltate indusium. 
Genus XX. — DiDYMOCHLiENA. Sori reniform, on the intra 
marginal raised end of a vein, and covered by a reniform 
