142 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



the same as in O. lasiandra. Stomata were present, some of them 

 functional, in the etiolated examples, and the guard cells were always 

 filled with starch. The epidermal and hypodermal layers as well as 

 the cortex did not differ greatly from the normal except that the ele- 



FiG. 97. Oxalis violacea. Etiolated leaf Fig. 98. Oxalis violacea. Transverse 

 after a few days' illumination. section of stelar region of normal petiole. 



ments of the cortex had a greater radial measurement than m the 

 normal. The three bundles in the petiole were separated by two or 

 three layers of parenchyma in the etiolated, and by but one in the 



Fig. 99. Oxalis violacea. Transverse section of etiolated petiole. 



normal. On the other hand the larger vessels were separated from 

 each other by one or more layers of parenchyma in the etiolated 

 while they appeared in contact in the normal. The sieve tissue 

 seemed more irregularly developed in the etiolated. The laminae 



