HORSETAILS AND CLUB-MOSSES 201 



During the Coal-measures the club-mosses occurred in 

 great abundance, and among them were large trees of vari- 

 ous kinds, forming a very prominent part of the forest 



B 



FIG. 193.Lycopodium: A, the whole plant, showing the horizontal stem giving 

 rise to roots and erect branches bearing strobili; B, a single sporophyll with its 

 sporangium; C, spores much magnified. After WOSSIDLO. 



vegetation. As in the case of the equisetums, therefore, 

 the club-mosses, or Lycopods as they are called, were once 



