160 BOTANICAL GAZETTE [FEBRUARY 
leaf strand and then connects with the phloem upon the upper 
side of the leaf strand. 
The roots grow in a slightly downward direction outward from 
the vascular cylinder. The root stele is monarch with the phloem 
above, as described for the roots of this species. Where these 
attach to a horizontal strand of the cylinder, the xylem and phloem 
are in the same relative positions in the two strands, and they 
Fics. 6, 7.—Fig. 6, transverse section of cylinder strand of protocorm: arrow 
indicates direction of central pit; », phloem; 236; Fig. 7, diagonal section of 
young cylinder strand of protocorm: arrow indicates direction of central pit; p, 
phloem; X 236. 
connect directly. Where a root connects with a vertical strand of 
the cylinder, the xylem of the root connects directly with that 
of the cylinder strand; the phloem of the root swings to the side of 
the cylinder strand and passes around to its inner side, where It 
connects with the phloem of that strand. : 
The roots are very numerous. There are about sixty-five = 
which xylem has been differentiated, and probably fifteen more 
