Hymenophylloceae , Schizaeaceae and Gleicheniaceae . 525 
Fig. 26. — A-C, transverse sections of the seedling-stem of Sckizaea pusilla : 
A , close above the primary root and before the separation of the first leaf ; 
B , separation of the third leaf-trace (pc', xylem of the latter) ; C, after departure of 
the fourth leaf-trace. D and E, petiolar bundles of second and first leaf respectively 
of S. pusilla. F, S. dichotoma , small form, protostelic region of the stem. 
central tracheides and endodermis of S. dichotoma from Fig. 25, F. A, B, C, 
G, x 260 ; D, F, x 600. 
