460 



BOTANY 



TART 11 



branches are developed in the axils of the scale leaves, lint not having space to 



i\^<J»cfr 



Fig. 40S. — Eiinisetinn arvense. A, FNn-tile shoots, spriiigingfroni tlicHiizoniP, which also bears tnlipis ; 

 tVie vpgetativn shoots have not yet unfolded. F, Sterile vegetative .shoot. B, C, Sporophylls 

 bearing sporangia, which in C have opened. D, Si)ore .showing the two spiral bands of the 

 periniuni. K, Dry spores showing the expanded spiral bands. {A, F, h nat. size. J5, C, D, K, 

 enlarg(^d.) 



grow upwards they pierce the narrow shoatli. As a result of tlie reduction of 

 the leaf laminae, the liaulins themselves assume the function of assimilation, 



I 



