840 



*** Fronds subternate and pinnatifid or bitripin- 

 natifid. 



Subgenus II. — Leucostegia. 

 Subgenus III. — Prosaptia. 

 Subgenus IV. — Eudavallia. 



* Fronds small temate or quinate. 

 ** Fronds decompoundly divided. 



Subgenus V. — Saccoloma. 

 Subgenus VI. — Odontoloma. 



* Simply pinnate. 



** Bipinnate, pinnules entire or only lobulate. 

 *** Bipinnate, pinnules deeply pinnatifid. 



Subgenus VII. — Microlepia. 

 Subgenus VIII. — Cuneatae. 



* Fronds not scandent, unarmed. 



** Fronds very long, scandent, spinous. 



Subgenus IX. — Dareoideae. 

 [Genus] 2. — Cystopteris. 



Tribe IV.— LINDS^EEiE. 



[Genus] 1. — Linds^ea. 



Subgenus I. — Eulindssea. 



* Fronds simple. 

 ** Fronds pinnate. 



t Costa excentric or marginal, or obso- 

 lete. Sori on the superior margin of 

 the unequal pinnae, 

 •ff Costa central. Sori on both margins 

 of the equal pinnae. 

 *** Fronds bi-tripinnate (in some states only 



pinnate) or decompound. 



(Costa excentric or marginal or obsolete. 

 Sori on the superior margin of the 

 unequal pinnae). 



Subgenus II. — Schizoloma. 



* Fronds simple or only lobed. 



