i6o 



MEMOIRS OF THE NEW YORK BOTANICAI. GARDEN, 



and a sparse root-system. 

 The maximum length of the 

 internodes was about 5 cm., 

 and the shorter ones were 

 perhaps half that length, the 

 whole stem showing a some- 

 w h a t uniform excessive 

 elongation of these organs, 

 and in no instance were the 

 leaves opposite or whorled. 

 The leaves borne on the 8 

 or 10 lower internodes were 

 small and bract-like, but 

 those borne on the upper 

 part of the shoot were of a 

 general form similar to the 

 normal, being about i cm. 

 in length, the petiole occu- 

 pying half that length. 

 These organs were recurved 

 with the apex of the lamina 

 in contact with the base of 

 the petiole. The curved and 

 pointed hairs were longer 

 than in the normal. 



The basal portion of the 

 etiolated plants had under- 

 gone discoloration of the epi- 

 dermal and subepidermal 

 tissues over a portion about 

 8 cm. in length. The maxi- 

 mum diameter of the etio- 

 lated stem was hardly great- 

 er than that of the normal 

 Fig. 119. A, ^uercus rubra. Etiolated seed- in any instance. As in the 



ling with portions of acorn still adherent. B, ^jj^gj. ^^-^^ examined, layers 

 etiolated seedling of ^ue re us up. 



of phellogen were formed in 

 the medio-cortex, while the external cortex and epidermis collapsed. 

 The inner cortex was somewhat more compactly arranged than in 



