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Section 2. FILICINE^. Ramification not 

 dichotomous. Leaves developed, frondose. 

 Sporangia not single and never on the upper 

 surface of the leaf. 



ORDER 1. RHIZOCARP^. Sporangia in 

 sporocarps (conceptacula); heterosporus; mi- 

 crosporangia, oo-spored; macrosporangia gen- 

 erally 1-spored. 



Family 1, MARSILJ3 ACE^ffi. 



Sporocarps 2-4-celled, 2-4-valved, contain- 

 ing macro- and microsporangia. Sporangia 

 parietal; macrosporangia, always 1-spored. 

 Vernation circinate. 



1, Marsilaea L- 



Macro- and microsporangia in the same spo- 

 rocarp. 1C- Fronds petiolate, 4-foliolate. 



1. M. VESTITA Hook. & Grev. Fort Point. 

 (Extinct.) 



2, Pillularia L. 



U . Fronds filiform. 



1. P.AMERICANA Al.Braun. Marin County. 



Family 2, SALVINIACE^E. 



Sporocarps2to oo, on the same petiole 

 (transformed half of a frond) , macro- and mi- 

 crosporangia in distinct sporocarps. Verna- 

 tion not circinate. 



