THE GREAT GEOLTS OF PTEEIDOPHYTES 163 



Fig. 137. A common c^uh-moss ( Lycopodivm clavat'tm): 1, the whole plant, showing 

 horizontal stem giving rise to roots and to erect branches btaring strobili; S, a 

 single sporophyll with its sporanginm; 3, spores, much magnified. — After Wos- 



SIDLO. 



88. Lycopodiuin, — This genus contains fewer forms than 

 the other, but they are larger and coarser and more charac- 

 teristic of the temperate regions, being the ordinary Club- 

 mosses (Fig. 137). They also more commonly display 

 conspicuous and distinct strobili, although there is every 



