96 
in thickened ends. Sori continuous on the 
‘lower two-thirds of the segments. 
Cultivated. 
Distribution : Ceylon—common about Galle 
and the Central Provinces ; Madras Presidency 
much cultivated, and said to be found wild in 
the Cochin forests.; Malacca.—West Tropical 
Africa; East African Islands ; Queensland ; the 
Philippines ; Polynesia. 
Genus XVIII.—CeEraropreris Brone. 
(Deriv. Gr. Keras, Keratos, a horn; pteris, a 
fern. The horned fern—in allusion to the stag- 
horn looking fronds.) 
A true water fern. Fronds fragile; fertile 
fronds decompound with the segments forked 
and pod-shaped. Sori Jinear, marginal, almost 
parallel. Veins of sterile frond transversely: 
elongated and distantly anastomosing. 
A very anomalous genus. 
Ceratopterts thalictroudes Brong. 
A water plant growing in stagnant pools, 
tanks and ‘marshes. Stipes somewhat quad- 
rangular, thick, inflated, filled with air spaces.' 
Fronds of two kinds. Barren ones, simple or 
slightly divided or 2-3 pirinate. Fertile ones 
