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STRUCTURE OF PETIOLE AND SCAPE ot 
composed of air spaces divided by chains and plates of parenchym- 
atous cells, with vascular bundles scattered promiscuously 
through the spongy mass (TEXT FIGs. 42-47). The vascular 
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Fic Part of a cross section of a scape, showing peripheral region with 
bundles having strands of collenchyma, and the large air spaces of the pith. X 20. 
An average peripheral bundle from a petiole. X 65. 
Fic. 44. An average peripheral bundle from a scape, showing chlorophyll- 
bearing cells. X 65. 
Fic. 45. A bundle from the pith of a petiole. S, schizogynous vessel. X 65. 
Fic. 46. Average bundle from petiole pith. X 65. 
Fic. 47. A large bundle from scape pith, showing large phloem area. X 65. 
bundles of the pith region are, as a rule, similar to those of the 
periphery, but lack the strand of collenchyma. There is con- 
siderable difference in the size of the bundles, some showing only 
one or two small ducts and a corresponding number of phloem 
elements, while others show as high as twenty xylem elements. 
In general, the bundles of the scape are larger than those of the 
petiole and greater proportionate phloem area, as will be evident 
from a comparison of TEXT FIGS. 45 and 46 with TEXT FIG. 47. 
