452 Campbell . — The Gametophyte and Embryo of 
Text-fig. 8. Two sections of the sporophyte shown in Plate XVI, Fig. 16. pr , gametophyte; 
r 1 , r 2 , r s , the three roots; cot, cotyledon; Z 2 , second leaf; x, stem-apex, x 40. 
A 
Text- FIG. 9. a, Another section of the same sporophyte as in Text- fig. 8, showing the 
approximation of the xylems from the first and second roots, x 40. B. Another section showing 
the complete fusion of the xylems. c. Section of the first root showing single xylem. D. The same 
near the base, showing two very unequal xylems. 
