1914] HILL— ANATOMY OF LYCOPODIUM 77 



This is the usual condition of the vegetative portions of the stem 

 and can be designated as a radial arrangement. A clay model of 

 the xylem portions of the stele was made, and it shows something 

 of the xylem behavior in the stem (figs. 20, 21). No young vegeta- 

 tive shoots were present for comparison in this species, but the 

 mature vegetative stem, bearing strobili, shows the characteristic 

 structure of the stem (fig. 19). The phloem is distinct and is 

 recognizable earlier than in most of the species. 



Fig. 22. — L. Holstii: transverse section of the stele of a young shoot, showing the 

 radial arrangement; px, protoxylem; X500. 



Cortical roots occur toward the base of the stem as described 

 in L. carinatum, but their structure is similar to those described 



for L. pi thy ides. 



L. Holstii 



material 



vegetative shoots there were very few young ones. From a study 

 of a limited number of slides, it appears that the stele is organized 

 with a rather large number of protoxylem points (about 8). The 



1 Stokey, Alma G., The roots of Lycopodium pithyoides. Bot. Gaz. 44 ' 5 7^3- 

 Pis- 5, 6. 1907. 



