2l6 



OUTLINES OF PLANT LIFE. 



parent into nearly equal parts, each of which then continues 

 to grow. In most plants the bodies separated are small or 

 minute, compared with the parent. They are either spores 



^ 



Fig. 1S4.— a seedling potato plant, cis the base of thestenj, below which is the primary 

 root, r. The primary leaves c^, are still present. The early leaves, yi are not so 

 much branched as later ones will be. In the axils of the lower leaves arise the 

 branches b^ with scale leaves, e'c, and secondary roots, >-'. The tips of these branches, 

 when illuminated, bear foHage leaves, y^'; but usually they thicken into tubers, tb^ 

 which have scale leaves, e'c' , m whose axils buds, br-, are formed, the so-called " eyes " 

 of the tuber. Natural size. — After Duchartre. 



or brood buds. Spores of water plants are often motile ; 

 those of some water plants and most land plants are not, but 

 must be distributed by winds, water, or animals. The 

 spores are formed singly or in chains at the tips of special 



