2 
ORDER E1LICES. 
SUB-ORDER, HELICOGYRAT2E. 
TRIBE 1. 
Gleicheniacece. Kunze. Fronds creeping, spreading, gene 
rally dichotomous, pinnate, coriaceous, with gemmae in 
axils. Pinnules small, linear. Involucre none. Sort glo- 
bose, solitary or few. 
Gen. 1. — Gleichenia. Swartz. Sori immersed. 
Gen. 2. — Mertensia. Willd. Sori superficial, on a raised 
dotlike receptacle. 
To this tribe belong the genera Platyzoma, Brown, and Caly- 
mella, Presl, which are not, as far as is known, represented in 
South Africa. 
TRIBE 2 . 
Cyatheacece. Endlicher. Plant arborescent. Stem erect. 
Involucre cup-shaped, inferior, or wanting. 
Gen. 1. — Cyathea. Smith. Sori on fork of veins, with an 
involucre. 
Gen. 2. — Alsophila. Br. (Hemitelia, Presl). Sori at base 
of veins, with spurious involucre. 
Schizocaena, I. Smith., Cnemidaria, Pr., Trichopteris, Pr., Me- 
taxva,Pr., andGymnosphaera, Blume., are not represented in South 
Africa. 
Sub-order Cathetogyram. 
GROUP 1, having an involucre (true or spurious.) 
TRIBE 1. 
Peranemacece . Pr. Sori globose, pedunculate, or on 
middle of superior veinlet. Involucre inferior, covering the 
sori. 
This tribe, containing Peranema, Don., Diacalpe Blume, Wood- 
sia, Br., and Hypoderris, Br., is not represented in South Africa. 
TRIBE 2 . 
Aspidiacece. Pr. Sori globose, on middle, seldom on apex, 
of veins. Involucre superior, free, except at point of 
insertion ; deciduous. Rhizome creeping, or sub-globose. 
Sect. 1. — Nephrodiarice. Pr. Involucre kidney-shaped, 
Gen. 1. — Lastrea. Pr. Veins simple or forked. 
