8 
TRIBE 11. 
Acrostichaceee. Pr. Sori superficial, covering the whole 
of* the underside of frond. Fertile frond generally contracted. 
Rhizome creeping or sub-globose. 
Gen. 1. — Stenochlcena. I. Sm. Fertile frond contracted, 
with revolute margins. 
Gen. 2. — Olfersia. Raddi. Fertile frond contracted, 
with flat margin. Veins of sterile frond parallel, close. 
Gen. 3. — Acrostichum. L. Fertile frond not contracted. 
Veins anastomosing regularly in long hexagons. 
Polybotrya,Humb. and Bonp., Elaphoglossum, Schott., Aconiop- 
teris, Pr , Cam pi urn, Pr., Platycerium, Desv., Paecilopteris, Pr., 
Gymnopteris, Bernh., and Photinopteris, I. Sm., are not repre- 
sented in South Africa. 
TRIBE 12. 
Hymenophyllece. Endlicher. Son marginal, lateral or 
terminal, at end of vein. Involucres monophyllous. Recep- 
tacle elongated, columnar, or filiform. Capsules sessile, 
covering more or less the receptacle. Caudex 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 fiond,” is placed by Sir 
W. Hooker next to the genus Loxsoma, in his tribe Dicksoniacese. 
Gen. 1. — Hymenophyllum . Sm. Receptacle generally 
included. Involucre bivalved, cup-shaped, or orbicular. 
Gen. 2. — Trichomanes. Linn. Receptacle generally ex- 
serted. Involucre tubular, sub-cylindrical, generally entire. 
Order PAPKERIACE.ZE. 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 SCHIZiEACEHL Mart. Spore cases dorsal, 
with a complete terminal contracted ring. Spores pyramidal 
or conical. 
Gen. 1. — Schizcea. Sm. Spore cases oval, sessile, vas- 
cular, reticulate, placed on linear or pinnated appendages. 
