GENERA OF BEITISH FERNS. 53 



OPHIOGLOSSACE/E = Ferns ha^ang the young leaves 

 folded up straight, the spore-cases destitute of an elastic 

 ring, and two-valved. It contains the genera Botrychium 

 and Ophioglossum. 



18. Botrycliium = Marginal-fruited Ferns, having the 



spore-cases in irregularly branched clusters, on a 

 separate branch of the frond. 



19. Ophioglossum = Marginal-fruited Ferns, having the 



spore-cases sessile in two-ranked simple spikes ter- 

 minating a separate branch of the frond. 



II. CLUB-MOSSES = XrC0P0i)/xl(7^''.Ii'. 



Floicerless plants, hearing spore-cases, icithfrom one to 

 three cells in the axils of their leaves. They consist 

 of the f/enera Lycopodium and Selaginella. 



20. Lycopodium = Moss-like plants, with leafy stems, 



the fructifications consisting only of one-celled spore- 

 cases, containing pulverulous spores. 



21. Selaginella = Moss-like plants, with leafy stems, the 



fructifications consisting of one-celled spore-cases, 

 containing pulverous spores, and three or four-celled 

 j spore-cases, containing large granular spores. 



