TABLE OF GENEEA. 47 



and two-valved. It contains the genera BoUyckwm 

 and Oplnoglossum. 



1 7 . OpJdoglossum = Marginal-fruited Ferns, having the 

 spore-cases sessile in two-ranked simple spikes 

 terminating a separate branch of the frond. 



18. Botn/chium = Marginal-fruited Ferns, having the 



spore- cases in irregularly branched clusters, on a 

 separate branch of the frond. 



II. CLUB-MOSSES LYCOPODIACES& 



Plowerless plants, bearing spore-cases in the axils of 

 their leaves, and having reproductive bodies of two 

 different kinds, but of a similar nature. They con- 

 sist of the genus Lycopodium. 



19. Lycopodmm = Moss-like plants, with leafy stems, 

 having the fructifications elevated in terminal 

 spikes, or in the axils of the leaves. 



III. PEPPEKWOETS MARSILEACEJE. 



Flowerless plants, bearing axillary or radical spore- 

 cases, and reproductive bodies of two dissimilar 

 sorts. They comprise the genera Isoetes and 

 Pilularia. 



