16 Russell — Comparison of the Structure of Hybrid 



detentive. This region, absent in S. flava, is characterized 

 by large regular wavy- walled cells with numerous glands — 

 6.6 per field. These cells are smooth, without a suggestion 

 of any hair process. The lower conducting area in the hybrid 

 represents a crossing of the lower conducting area of 5". flava 

 with the glandular area of S. purpurea. There is no marked 

 difference between the upper and lower portions of the con- 

 ducting surfaces in the hybrid, excepting for a tendency toward 

 lengthening of the cell process, and for the presence of numerous 

 glands. 



On the upper conducting regions of 5. flava there are 3 glands 

 per field; in S. purpurea there are 4 per field; in S. Catesbaei 

 2.9 per field in this region. The lower conducting surface in 

 S. flava is devoid of glands; the glandular surface of S. purpurea, 

 as has been mentioned, has 6 glands per field; in the hybrid 

 there are 3, about half as many as are on the glandular area in 

 5. purpurea. 



The lengthening of the cell process noted above for the hybrid 

 in this region may be due to the influence of the S. flava type 

 of conducting cells, or merely be the exhibition of the tendency 

 shown in all forms for the conducting cell process to become 

 prolonged deep in the pitcher. 



In the extreme lower conducting and upper detentive sur- 

 face, the hybrid presents an interesting condition. This region, 

 which represents a crossing of glandular-detentive area of S. 

 purpurea with conducting-detentive of 5. flava, exhibits a most 

 confused zone about 1-1.5 cm. wide. There are several types 

 of cells shown in this region: 



First, normal conducting cells which become gradually elong- 

 ated and give place to detentive surface cells. 



Second, cells intermediate in size and shape between the 

 glandular surface cells of S. purpurea, and the detentive sur- 

 face cells of S. flava. These are long narrow cells with wavy 

 walls. They appear at first isolated as islands of two or more 

 cells, in the lower conducting surface; becoming more numerous 

 below, and gradually giving place to normal detentive-surface 

 cells. These cells represent a blending of the glandular sur- 

 face cells of 5. purpurea, with the unmodified epidermal cells 

 of the detentive surface of S. flava. 



Third, normal detentive surface cells, polygonal in shape, 

 some bearing long hair processes. These appear isolated in 



