341 
structure, with both conspicuous xylem and phloem. The 
endodermis (as a Caspary layer), is absent, as it is always the 
case in Botrychium. The junction of root and leaf traces shows 
that the primary xylem of the leaf, which was situated at its 
ventral side, becomes the innermost part of the xylem, while 
we 
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Fig. 9. Fig. 10. 
the protoxylem of the root is situated at the periphery. Hence 
the confusing statements as to the position of the protoxylem 
in the stem-stele. Lang (22), Bower (4). 
At the place of transition between root and leaf, there occurs 
a cork cambium (Fig. 8), which develops after the young sporo- 
phyte has pushed through the prothallus and the second and 
third leaves make their appearance. The cambium is found at 
