XIII 



LYCOPODINEAL 



529 



chyma of the stem the chloroplasts are apparently of the ordi- 

 nary form, but a careful examination shows that they are all 

 connected, and are directly referable to the divisions of the 

 primary plastid in the young cell. In all cases the nucleus is in 

 contact with the chloroplast or group of chloroplasts (Fig. 

 306). The character of the chloroplasts here has its nearest 

 analogy in Anthoceros, where occasionally a division of the 

 chloroplasts is met with, especially in the elongated cells of the 

 sporogonium. 



B 



n 



cl-- 



IL.. 



FIG. 306. A, B, Cells of the mesophyll of Selaginella Martensii showing the single 

 chloroplast (cl) and the nucleus (n) ; C, chain of connected oval chloroplasts from 

 the inner cortex of the stem of S. Kraussiana, X64O (after Haberlandt). 



The Roots 



The roots in ^. Kraussiana are borne upon the special leaf- 

 less branches or rhizophores, which in structure are much like 

 the stem. Previous to the formation of the first roots upon the 

 rhizophore (Sadebeck (6) ), the apical cell is obliterated and re- 

 placed by a group of initial cells. The apical cells of the (usu- 

 34 



