120 VI. POLYPODIACEAE. § 3. DAVALLIEAE. 



inner side of the sorus, the point (or line) of insertion not covered 

 by the sporangia, at least when young. 



S. Indusium attached by a single point to the receptacle, otherwise 

 free. 



f Indusium inciso-lacerate. No. 316. lieptolepia. 



ff Indusium not inciso-lacerate. No. 34a. Davallodes. 



S.S. Indusium attached by a broad base to the receptacle or to the 

 receptacle and the parenchyma. 



3. Fronds divided ; leaflets dimidiate, i. e. with the half on the 

 lower side of the midrib cut away. No. 29. liindsaya. 

 3.3. Fronds simple or divided, if divided, the leaflets not 

 dimidiate, i. e. distinctly developed on both sides of the 

 midrib. 

 4. Stipes articulate to the rhizome. 



O Fronds membranaceous or herbaceous, surfaces 

 hairy or fibrillose. No. 34a. Davallodes. 



O O Fronds chartaceous or coiiaceous, or the surfaces 

 naked or scaly. 



= Indusium fastened by the base only, the sides 



and outer edge free. No. 32. Hiimata. 



== Indusium fastend by the base and sides, the 



outer edge only free. No. 34. Davallia. 



4. J. Stipes not articulate to the rhizome. 



5. Ultimate fertile segments cuneate or linear-cuneate, 

 bearing the sori on the truncate apex. 



No. 28. Otiontosoria. 

 5.5. Ultimate fertile segments otherwise. 



e. Sori uniting the tips of 2 or more veins or 

 veinlets. 



o Fronds pinnate; pinnae provided above 

 with minute, deciduous, cretaceous, sub- 

 marginal scales. 



(No. 17. Xephrolepis, § Lindsayopsis' . 



OG Fronds simple, if divided, without cretaceous 



scales. No. 30. ^chizoloiua. 



-' .«. Sori solitary on the veins, sometimes confluent 



in pairs. 



7. Sori terminal on very short and inconspicuous 



