XIII 



EQUTSETINEyE 



447 



finally become grown together with the epidermal cells of ihc 

 axis above the bud, which thus lies in a completely closed cavity. 

 As the bud grows it gradually destroys the tissue surrounding 

 the cavity, and finally breaks through the base of the leaf, 

 appearing from the outside as if it had developed from below 

 and not from the axil of the leaf. In most species these 



Fig. 234. — Section of a lateral bud, enclosed within the sheath formed by the leaf-base, X 175. 



branches remain simple, but in E. sylvaticinn and E. giganteiun 

 the secondary branches also ramify. 



TJie Roots 



The formation of the roots is intimately connected with 

 that of the lateral buds. Each bud normally produces a single 

 root below the first foliar sheath, which in the buds derived from 

 the rhizome all develop, whether the buds themselves grow 

 further or not. According to Janczewski, certain of these 

 rhizogenic buds of the rhizome produce several roots, but the 



