MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



155 



The etiolated leaves were small, recurved with a petiolar portion 

 a few millimeters in length, and the entire organ not more than 15 



Fig. 115. Etiolated branch of Popultts Simonii. 



mm. long. The upper surfaces of the atrophied laminae were in- 

 rolled. The leaves were distinctly yellow while the stems were 



Fig. 116. Popiilus Simonii. Partial transverse section of normal branch. A, 

 epidermis. B, coUenchyma. C, cortex. £>, bast fibers. E, cambium. F, wood. 



almost a pure white. The stipules were very nearly normal size in 

 etiolated examples. A most striking phenomenon consisted in the 



