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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.E. Sporangia in 

 sporocarps (conceptacula); heterosporus; mi- 

 crosporangia, co-spored; macrosporangia gen- 

 erally 1-spored. 



Family 1. MARSIL^ACE^. 



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

 ing macro- and microsporangia. Sporangia 

 parietal; macrosporangia, always 1-s pored. 

 Vernation circinate. 



1. Marsilaea L- 



Macro- and microsporangia in the same spo- 

 rocarp. — U- 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^. 



Sporocarps 2 to go, on the same petiole 

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

 crosporangia in distinct sporocarps. Verna- 

 tion not circinate. 



