ORDER FILICES. 



SUB-ORDER, HELICOGYRAT^. 

 TRIBE 1. 



GleicheniacecB. Kunze. Fronds creeping, spreading, gene 

 rally dichotoraous, pinnate, coriaceous, with gemmae in 

 axils. Pinnules small, linear. Involucre none. Sori glo- 

 bose, solitary or few. 



Gen. 1. — Gleichenia. Swartz. >So/*2 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. — Cyatliea. Smith. /Sorz on fork of veins, with an 

 involucre. 



Gen. 2. — Alsophila. Br. (Hemitelia, Presl). Sori at base 

 of veins, with spurious involucre. 



Schizocsena, I. Smith., Cnemidaria, Pr., Trichopteris, Pr., Me- 

 taxya,Pr.,andGymnosph3era, Blume., are not represented in South 

 Africa. 



Sub-order Cathetogyrat^. 



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. 



AspidiacecB. 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. — Lastna. Pr, Veins simple or forked. 



