232 BOTANY. 



The Club-mosses are common in the Appalachian region, Canada, 

 and northwestward, and all but one of our species belong to the 

 genus Lycopodium. Of these may be mentioned the common Club- 

 mosses (L. clavatum and L. complanatum) and the Ground-pine (L. 

 dendroideum), all extensively used in Christmas decorations. 



433. The Little Club-mosses (Order 34, SELAGiNELLBiE) 

 resemble the foregoing, but are generally smaller and 



Fio. 138.— Part of a Club-moss (Lycopodium clavatum), the running, 

 horizontal rooting stem below, with the spore-bearing cones, s, above. 

 One balf natural size. 



more Moss-like, and have (with few exceptions) four- 

 ranked leaves. Their spore-cases occur singly on certain 

 more or less modified leaves, which are clustered into 

 terminal spikes. The spores are of two kinds : the small 

 ones, which are very numerous, are generally borne in 

 spore-cases in the upper part of the spike, while the 

 larger ones (macrospores) are mostly four in each spore- 

 case in the lower part of the spike (Fig. 139). 



