The Ferns and Their Allies 287 



are much used for decorative purposes at Christmas time 

 and are sold under various names such as " ground pine " 



FIG. 1 70. Two species of club mosses (Lycopodium) . In one species (left) the sporangia 

 are borne in the axils of the upper leaves, in the other (right) they are borne in terminal 



and " running cypress." The main stems are prostrate on 

 the soil and may be many feet long. They are anchored at 

 intervals by short roots. Numerous upright branches rise 



