﻿132 VI. POLYPODIACEAE. 



§ 8. GYMNOGRAMMEAE. 



a. Veins free. 



b. Fronds not powdery beneath. 



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



or forked. No. 62. Coiiiogramine. 



C.C. Pinnae or pinnulae more or less deeply piunatifid; main veins 



pinnate in the lobes. (No. 60a. Phegopteris, § Leplogramme). 



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



powder. No. 63. Ceroptcriis. 



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



No. 66. SyngrAiniue, %% Toxopteris ^- Callogramme. 

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

 Pleocnemia. (No. 60&. Bictyopteris, § Digrammaria). 



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



1. Lower veins of contiguous groups uniting as in Nephrodium. Sori 

 free or joining in pairs. 



(No. 60a. Phegopterig, §.^ Slegnogramme ^ Meniscium). 

 1.1. Veins anastomosing more copiously and commonly irregularly. Sori 

 free or + reticulate. 



2. Sori irregularly longitudinal or subflabellate, running along the 



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



only. No. 64. Aii trophy uin. 



2.3. Sori oblique or sometimes subparallel to the costa. Costa 



distiuct quite to the apex. 



3. Fronds thick, veins all invisible. Sori free, parallel, trans- 

 versing the areolae. No. 65. fuoxograiume. 

 3.3. Fronds thinner, at least the main veins visible. Sori free 

 or reticulate, running along the veins. 

 4L. Sori with paraphyses. 



No. 66. ^yngramiuc, § Dicfyogramme. 

 4I.#. Sori without paraphyses. No. 67. Heiiiioiiiliis. 



9. GRAMMITfDEAE. 



1. Fronds simple, rarely forked or suhdichotomous, mostly grass-like. (Vil- 

 larieae). 



