(335) 



slum hyaline, laterally affixed, free towards the 

 margin of the frond. — U- 



1. C. FRAGiLis Bernh. — Tamalpais. 



Order 3 STIPULAT.E. Isosporous. 

 Leaves stipulate. 



Family 1. OPHIOGLOSSE^. 



Sporangia capsular developed in the paren- 

 chyma of half of the frond. Vernation not 

 circinate. 



1. Botrychium Swartz. 



Fertile segment of the frond a compound 

 spike. Sporangia distinct, glabrous, distich- 

 ous, nearly 2-valved. — 21- 



1. B. TERNATUM Swartz. — San Francisco. 

 (Extinct.) 



Section 3. Equisetace^. Stem artic- 

 ulate; internodes surrounded by sheathing 

 whorls of scarious leaves. Sporangia on the 

 under side of verticillate, peltate receptacles 

 forming a terminal spike. Spores go, each 

 furnished with two elaters. 



1. Equisetum L- 



Horsetail. Scouring-rush. 



Only genus. 



1. E. Telmateia Elirh. Sterile stems green 

 with verticillate branches; fertile stems wdth- 



