GENERA OF BRITISH FERNS. 
53 
OPHIOGLOSSACE^ = Ferns having the young leaves 
folded up straight, the spore-cases destitute of an elastic 
ring, and two-valved. It contains the genera Botrychium 
and OpMoglossum, 
18. Botrychium = 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 = i;F(70P0i)/^ 67^^. 
Flowerless plants^ hearing spore-cases, with from one to 
three cells in the axils of their leaves. They consist 
of the genera 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 
spore-cases, containing large granular spores. 
