184 BOTANICAL GAZETTE [MARCH 
closure of leaf gaps, 7 fuse with the inner surface of the cylinder, 
4 disappear by fusion with other strands, and 3 disappear by the 
gradual fading out of the procambium. They range in length from 
N 
WFso 
Fic. 12.—Stele with medullary strands; only the xylem is shown: m, first medul- 
lary strand; X4.5. 
