124 VI. POLYPODIACEAE. § 10. POLYPODIEAE. 



C.C. Fronds simple or divided ; sori not restricted to much 

 contracted higher segments. 



*. Fronds dimorphous, barren sessile, humus-collecting, 

 fertile stalked. No. 73. Drynaria. 



t.l. Fronds uniform, if dimorphous, then not as in t. 



3. Veins free or anastomosing regularly; areolae with 

 the free included veinlets directed towards the 

 margin. No. 71. Poly podium. 



3.9. Veins anastomosing irregularly; areolae with the 

 free included veinlets mostly spreading in various 

 directions, rarely wanting or directed towards the 

 costa or the margin. 



3. Sori not on marginal outgrowths of the fronds. 



No 71«. Pleopeltiis. 



3.S. Sori on specialized marginal outgrowths of the 



fronds. No 716. liecanopteris. 



a.a. Sori elongated, more than 3 X as long as broad, continuous or 



interrupted. 



o Sori oblique to the costa and margin, several on each side of 

 the costa. No. 71a. Pleopelttis. 



OO Sori parallel to the costa or margin, 1 on each side of the costa. 

 » Fronds dimorphous. 



f Fronds simple. No. 75. Drynioglossum, 



f f Fronds, at least the barren ones, not simple, 



No. 76. ChrijStopteris. 



»• Fronds not dimorphous, at best somewhat contracted in the 



fertile region. No. Iha. Paltoniiim. 



11. ACROSTICHEAE. 



±., 1.1. Etc. 



2., 3., 3.3., 1. Etc. 

 1.1. Etc. 



5. Leaflets not articulate to the rachis. 



No. 80. Polybolrya. 

 5.S. Leaflets articulate to the rachis. 



No. 86c. EiOinasraiuuia. 



II 



