THE GREAT GROUPS OF I'TEKIDOPIIYTES 163 



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Fig. 137. A common club-moss (Lycopodium davatum): 1, the whole plant, showing 

 horizontal stem giving rise to roots and to erect branches bearing strobili; 2, a 

 single sporopiiyll with its sporangium; 3, spores, much magnified.— After Wos- 



SIDLO. 



88. Lycopodium. — This genus contains fewer forms than 

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

 teristic of the temperate regions, heing the ordinary Chib- 

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

 conspicuous and distinct strobili, although there is every 



