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sium hyaline, laterally affixed, free towards the 
margin of the frond.—2r. 
1. C. FRracitis Bernh.—Tamalpais. 
‘Orperk 8 STIPULATZ. Isosporous. 
Leaves stipulate. 
Family 1. OPHIOGLOSSEZA. 
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.—2¢. 
1. B. rernatum Swartz.—San Francisco. 
(Extinct. ) 
Section 3. EquisetTaces. 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 o, each 
furnished with two elaters. 
1, Equisetum L. 
HoRseEvalt. ScoURING-RUSH. 
Only genus. 
1. E.Tetmarzia Ebrh. Sterile stems green 
with verticillate branches; fertile stems with- 
