Ko. 483] STUDIES OF THE OPHIOGLOSSACE.E 



155 



two at the base of the petiole, and these branches divide again 

 somewhat higher up (Figs. 14, A to C). Of the four bundles thus 

 formed, the two larger adaxial ones are those which supply the 

 spike, the smaller abaxial ones supplying the lamina. In larger 



specimens of this species (Fig. 14, D), and the same is true in B. 

 virginianum, there may be a subsequent branching of some of the 

 bundles, so that a cross section of a stout petiole shows a larger 

 number of bundles, sometimes as many as ten. 



Sections made at the junction of the spike and lamina (Fig. 14, 

 E) show anastomoses of some of the bundles which appear elon- 

 gated in section, but there seems to be no regular rule governing 

 the fusion of these. It is not quite clear whether any branches 

 are given off from the spike bundles ijito tlie laniiiia. hut this is 

 probably the case in regard to the two hit(>ral scpnciits of the 

 lamina. Within the peduncle of the >]>\kr in ihr lai-vr speci- 

 mens (Fig. 11, (;) th(> two original binidle.. are auain clearly 

 defined, but in some of the >niailer specimens these niav be com- 



