MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. lOI 



prostrate with the apical, terminal portion apogeotropic, and bearing 

 the small undeveloped laminae with the upper (inner) surfaces ap- 

 pressed. The petioles and laminae were purplish in color, and the 

 epidermis bore short hairs filled with a reddish cell sap. The etio- 

 lated hairs were slightly smaller than the normal. The epidermal 

 cells were excessively elongated, being four or five times as long as 

 the normal, and the stomata were larger and apparently functional. 

 The production of leaves continued more or less irregularly dur- 

 ing a period of i8 months, and then the activity slowed down, and 

 the corms went into a state of rest from which it was impossible to 

 rouse them, although still sound and healthy. In no instance were 

 the flower stalks developed. 



Cypripedium montanum Dougl. 



Dormant specimens of Cypripedium were placed in the dark 

 chamber in January, 1900, and began growth a month later. Two 

 months later a young flower bud was pushed out from among the 

 etiolated leaves, but did not open or attain normal size. 



Fig. 56. A, epidermis from normal leaf of Cypripedium monianum. ^, glandular 

 hair from surface of normal leaf. C, epidermis of etiolated leaf. D, glandular hair 

 from etiolated leaf. 



The main stem attained a length of only 2 cm., which is only a 

 fraction of that of the normal. The excessively elongated leaves 



