138 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



etiolated specimens was about the same, but those in diffuse Hght were 

 much heavier, probably in response to the mechanical stimulus of the 

 weight of the leaflets. The laminae remained in the folded condi- 

 tion in which they emerged from the bud, in the etiolated examples, 

 and attained only about one fifth of the volume of normal examples. 



B 



Fig. 96. Oxalis lasiatidra. Surface view of epidermis of petiole, A, etiolated; 

 B, normal. 



The epidermal cells of the etiolated petioles had an average meas- 

 urement of 127.4 as compared with the normal of 129. i, and a width 

 of 4.91 as compared with the normal at 6.14. The number of sto- 

 mata included in a microscopic field from the etiolated specimen at 



