III. DAV ALLIED. 



Sori (except in Oleandra) terminal on their veins, on or near the margin 

 of the frond; indusium opening toward the margin (wanting in Mona- 

 chosorum ) ; margin of frond often modified in connection with sorus ; 

 stipes articulate to rhizome, or not; fronds usually at least deeply pin- 

 natifid; pinnules of segments usually more developed on the acropetal side. 



1. Pinnae not dimidiate, i. e., the lamina is more or less 

 developed on both sides of the costa. 

 2. Sori separate and distinct. 



3. Indusium fastened at the base only. 

 4. Pinnae articulate to the rachis. 



5. Stipe articulate to rhizome (11) Arthropteris 



5. Stipe not articulate to rhizome.. (12) Nephrolepis 

 4. Pinnae not articulate to the rachis, or 

 frond simple. 

 5. Stipe articulate to rhizome. 



6. Sori dorsal on veins, near 



costa (13) Oleandra 



6. Sori marginal or sub- 

 marginal (14) Humata 



5. Stipe not articulate to rhizome.. (15) Saccoloma 

 3. Indusium fastened at base and sides. 



4. Stipe articulate to rhizome 1(16) Davallia 



[Microlepia ciliata 

 4. Stipe not articulate to rhizome. 



5. Margin of frond hardly modified. 



6. Ultimate divisions of frond 



not cuneate nor sori 



marginal (17) Microlepia 



6. Ultimate divisions cune- 

 ate, with sori on the 



broad apex (18) Odontosoria 



5. Margin united with indusium to 



form a cup-shaped receptacle.. (19) Dennstaedtia 



3. Indusium wanting (20) Monachosorum 



2. Sorus continuous around the pinna (21) Schizoloma 



1. Pinnae dimidiate, lower half obsolete (22) Lindsaya 



(11) ARTHROPTERIS J. Smith, Diels. 



Rhizome scandent, stipes articulate to it or a little above it; frond 

 pinnate, the pinnae articulate to the rachis; sori orbicular, indusium round- 

 reniform, fixed by the sinus, or (not in Philippine species) wanting. 

 A small genus very near Nephrolepis. 



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