PTERIDOPHYTES 



95 



Roots not only receive water, but they also anchor the I 

 plant in the soil, so that the grip of the roots and the rigidity ' 

 of the stem hold the plant firmly in place. 



FIG. 75. A club-moss (Lycopodium) : A, the whole plant, showing the horizontal 

 and very leafy stem giving rise to roots and erect branches bearing very distinct 

 strobili (composed of sporophylls) ; B, a single sporophyll with its sporangium ; 

 C, spores much magnified. After WOSSIDLO. 



The root differs very much from the stem in structure, and 

 especially is it different in its vascular cylinder, and in the 



