1 32 VI. POLTPODIACEAE. 



§ 8. GYMNOGRAMMEAE. 



a. Veins free. 



6. Fronds not powdery beneath. 



c. Pinnae or pinnulae entire or denticulate ; main veins close, simf 



or forked. No. 62. ConiograniiiK 



C.C. Pinnae or pinnulae more or less deeply pinna ti fid; main vei) 



pinnate in the lobes. (No. 60a. JPhegopteris, § Leptogramm 



h.b. At least the fertile fronds coated beneath with a white or yello 



powder. No. 65. Ceropteri 



a.a. Veins uniting 1 — 3 X ^t or near the margin. 



No. 66. Syngramina, §§ Toxopteris ^ Callogramn 

 a.a.a. Main veins and the lower ones of the same group uniting as 

 Pleocnemia. (No. 606. IHctt/opteri*, § Digrammari 



a.a.a.a. Veins anastomosing otherwise. 



±. Lower veins of contiguous groups uniting as in Nephrodium. S( 

 free or joining in pairs. 



(No. 60a. JPhegopteris, §§ Slegnogramme ^ Memsciun 

 1.1. Veins anastomosing more copiously and commonly irregularly. Sc 

 lo-U^^^ free/or + reticulate. 



,8. Sori irregularly longitudinal or subflabellate, running along t 



veins. Costa wanting, or present in the lower half of the froi 



only. No. 64. Aiilropbyuii 



Z.Z. Sori oblique or sometimes subparallel to the costa. Cos 



distinct quite to the apex. 



3. Fronds thick, veins all invisible. Sori free, parallel, trai 



versing the areolae. No. 65. liOXOgramin 



3.3. Fronds thinner ; veins distinctly visible when seen lowai 



the light. Sori free or reticulate, running along the vei 



§ 9. GRAMMITIDEAE. 



1. Fronds simple, rarely forked or subdichotomous, mostly grass-like. (I 



laxkae). 



