528 



BOTANICAL GAZETTE 



[DECEMBER 



In some of the leaves examined the vascular supply of the 

 abortive spike consisted of a single pair of strands, that is, one 

 from each side, but in such cases there were two pairs of strands for 



i 



12 



Figs. 11-15. — Diagrams following the series shown in figs. 3-10, illustrating the 

 origin of strands which supply the first pair of sterile pinnae; fig. n, 5 mm. above 

 abortive spike; fig. 12, 1 cm. above it; figs. 13-15, opposite the point where the 



