326 



THE LYCOPODIALES 



water rapidly owing to the limited amount of conducting tissues 

 and to the exclusion of the atmosphere by the water which sur- 

 rounds the roots (see pages 43, 49), consequently they are at 

 the same disadvantage and require the same protective devices 

 as plants living in arid localities. 



Order 4. Lycopodiales. The Club Mosses 



115. General Characters. — The members of this group are 

 popularly known as the club mosses owing to their small moss- 

 like leaves and the arrangement of the spore-bearing leaves into 



Fig. 236. A common club moss, Lycopodium annolinum, with creeping 

 stem and erect branches covered with small moss-like leaves: s, strobilus; 

 r, roots. — H. O. Hanson. 



club-like strobili or cones (Fig. 236) . The gametophyte or sexual 

 generation is also suggestive of the mosses. Particularly is this 



