xiv] 



LYCOPODIUM 



41 



than occurs in the majority of vascular plants in which stem 

 and root have more pronounced structural peculiarities. A 

 pericycle, 2—6 cells in breadth, encloses the xylem and phloem 



Fig. 125. A. Lycopodium dichotomum. Transverse section of stem : Ic, leaf- 

 cushion ; It, leaf-trace ; K, roots. 



B. L. cernuum, portion of cortex of fig. H, enlarged. 



C. L. saururus. Cortex: It, leaf-trace; a, thin-walled tissue; 



b, thick-walled tissue ; Ic, lacuna. 



D. L. saururus. Stele ; x, xylem ; p, phloem. 



E. Portion of fig. D, enlarged : px, protoxylem ; p, phloem. 



F. Transverse section of leaf of Lycopodium. 



G. Vascular bundle of leaf ; px, protoxylem. 

 H. L. cernuum: b, branch of stele; c — c", 



cortex ; It, leaf-trace. 

 I. Stele of fig. H, enlarged (phloem omitted). 



cortex ; s, space in 



bands and this is succeeded by an endodermis, 2 — 3 cells broad, 

 with vaguely defined limits. In L. clavatum, as in L. aljmium, 

 another British species, the broad cortex is differentiated into 



