TRIBE 11. 



Acrostichacece. Pr. Sori superficial, covering the whole 

 of tlie underside of frond. Fertile frond generaWy contracted. 

 Rliizonie creeping or sub-globose. 



Gen. 1. — StenoclilcEna. I. Sm. Fertile frond {iouiYiXQ,iQ(\f 

 with revolute margins. 



Gen. 2. — Olferda. Raddi. Fertile frond contracted, 

 with flat margin. Veins of sterile frond parallel, close. 



Gen. 3. — Acrostic hum. L. Fertile frond not contracted. 

 Veijis anastomosing regularly in long hexagons. 



Polybotrya,Humb, and Bonp., Elaphoglossum, Schott., Aconiop- 

 teris, Pr , Campium, Pr., Platycerium, Desv., Paecilopteris, Pr., 

 Gymnopteris, Bernh., and Pbotinopteris, I. Sm., ai-e not repre- 

 sented in South Africa. 



TRIBE 12. 



Hymenophyllecp.. Endlicher. Sori marginal, lateral or 

 terminal, at end of vein. Involucres monophyllous. Recep- 

 tacle elongated, columnar, or filiform. Capsidcs sessile, 

 covering more or less the receptacle. Caudi<x creeping, 

 filiform, slender. 



This tribe, " chiefly founded upon the complete transverse ring 

 of the capsules, the very much elongated, columnar or filiform 

 receptacle, and the delicate texture of the frond,'' is placed by Sir 

 W. Hooker next to the genus Loxsoma, in his tribe Dicksoniacese. 



Gen. 1. — Hijmenopliyllum. Sm. Rcceptach generally 

 included. Involucre bivalved, cup-shaped, or orbicular. 



Gen. 2. — Trichomanes. Linn. Receptacle generally ex- 

 serted. Involucre tubular, sub-cylindrical, generally entire. 



Order PARKERIACE^Ij]. Hook. Aquatic Ferns, 

 with spore cases very thin, surrounded by a broad, imperfect, 

 or obsolete ring. 



This order, containing Ceratopteris, Brongniart , and Parkeria, 

 Hook., is not represented in South Africa. 



Order SCHIZiEACEiE. Mart. Spore cases dorsal, 

 with a complete terminal contracted ring. Spores pyramidal 

 or conical. 



Gen. 1. — Schizcea. Sm. Spore cases oval, sessile, yas- 

 cular, reticulate, placed on linear or pinnated appendages. 



