XIV 



L YCOPODINE^E 



497 



to one side, and thus produce the appearance of a true dicho- 

 tomy, but this does not ahvays occur. 



The leaves arise much in the same way that the branches 

 do, but do not develop a single apical cell. The growth is 

 much the same as in the first leaves of the embryo, and as in 

 these the early growth is due mainl}- to a row of marginal 



Fig. 261. — Selagifiella Kraussiana (A. Br.). Horizontal section of the apex of the stem, X77 ; B, 

 the apical meristem of the same, X 450 ; s, the ape.x of the main a.xis ; /, a young lateral branch ; 

 B, B, young leaves ; L, ligula of the leaf ; C, D, longitudinal sections of the base of older leaves, 

 X 450 ; 2, /, lacuna surrounding the vascular bundles of the stem ; /, one of the trabeculas. 



initial cells from which segments arc cut off altcrnatel\- above 

 and below. 



If we examine a longitudinal section of the stem a short 

 distance below the apex (Fig. 261, A), we find a regular 

 intercellular space formed between the central cylinder (or 

 cylinders), which completely surrounds it, and becomes very 



2 K 



