20 Russell— Comparison of the Structure of Hybrid 



are so enlarged that they become confluent, and the whole 

 upper portion appears dazzling white. To this variety has 

 been given the name alba. The typical hybrid shows a green 

 pitcher with white areolations over the lid and upper tube; 

 together with the red throat of S. flava, which is here lessened 

 in intensity. There is also a hybrid (n) noted with the white 

 variety of S. Drummondii named above. In it the hybrid is 

 pale, with pronounced areolations, as in S. Drummondii. Where 

 the ruddy varieties are crossed the hybrid is very beautifully 

 colored. The throat and rim are velvety red, with white areo- 

 lations and crimson veining over the lid and pitcher. 



Outer Surface of the Lid 



The outer epidermal cells of S. Drummondii (PI. Ill, fig. n) 

 are slightly angular-rounded in shape. The cell walls project 

 upward into a slight rounded papilla. This has been noted 

 by Macfarlane (28). The stomata are grouped in special tracts 

 above the veins between the areolations on the lid. The glands 

 are more numerous over this special region also, but are sparsely 

 scattered over the entire surface. The hairs are short and 

 blunt above the veins. Around the window areas the hairs 

 are longer. 



In 5. flava the cells are longer than broad, with wavy walls. 

 The surface of the epidermis is flat, the hairs, stomata, and 

 glands are quite evenly distributed over the entire surface of 

 the lid. There is no suggestion of grouping of the stomata in 

 any special region. 



The epidermal cells in the hybrid (PI. Ill, fig. 12) are squar- 

 ish, with slightly wavy walls. There is very little or no swelling 

 of the upper cell surface. The stomata are distributed in tracts, 

 but these areas are wider, and the stomata are less closely 

 grouped. There are spaces devoid of stomata as in S. Drum- 

 mondi, where the glands are sparsely distributed. The hairs 

 are long and strong over these areolations. 



Inner Lid Surface 



On the inner surface of the lid of 5. Drummondii (PI. IV, 

 fig. 18) the cells are wavy walled, measuring .06 x .05 mm. to 

 .05 x .04 mm. See PI. IV, fig. 16 for the appearance of the 

 lid cells of S. flava, already described above in detail. The cells 

 of the lid of the hybrid are intermediate in shape (PI. IV, fig. 19). 



