366 BOTANICAL GAZETTE [xovembes 



Fig. 42. — Bundle c at a lower level; large xylem cell centripetal to smallei 

 ones, indicating possible exarch condition. 



Fig. 43. — Bundle gb at level of fig. 17, showing collateral endarch character 



PLATE XXVI 



Figs. 44-47. — Fusion of bundles/ and a (see figs. 15-17): in fig. 44/ is 

 concentric, a, mesarch collateral; section 60 /x below level of fig. 15; fig. 45 

 enlarged view of bundle fa of fig. 16, 80 /x below fig. 44; fig. 46, 2 bundles neai 

 together 20 fi below fig. 45; fig. 47, fusion bundle fa 30 \x below fig. 46. 



Fig. 48. — Transverse section of bundle km near level of fig. 22. 



