(335) 



slum hyaline, laterally affixed, free towards the 

 margin of the frond. It. 



1. C. FRAGILIS Bernh. Tamalpais. 



ORDER 3 STIPULATE. Isosporous. 

 Leaves stipulate. 



Family 1. OPHIOGLOSSEJE, 



Sporangia capsular developed in the paren- 

 chyma of half of the frond. Vernation not 

 circinate. 



1. Botrychium Swartz. 



Fertile segment of the frond a componnd 

 spike. Sporangia distinct, glabrous, distich- 

 ous, nearly 2-valved. It. 



1. B. TERNATUM Swartz. San Francisco. 

 (Extinct.) 



Section 3. EQUISETACEJE. 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 oo, each 

 furnished with two elaters. 



1, Equisetum k- 



HORSETAIL. SCOURING-RUSH. 



Only genus. 



1. E. TELMATEIA Ehrh. Sterile stems green 

 with verticillate branches; fertile stems with- 



