26 Russell— Comparison of the Structure of Hybrid 



The glands in these three forms are most numerous about 

 the pitcher rim, and quickly lessen in number one inch or so 

 below the rim. They are scattered sparsely for a short space 

 below, but cease entirely beyond the upper one-third of the 

 conducting surface. In S. Sledgei the glands are remarkably 

 numerous, 7-8 per field over the upper region, near the rim. 

 In S. Drummondii they are more infrequent and average 3-4 

 per field. In the hybrid there are almost as many as in S. 

 Sledgei — 6-7 per field. In the extreme lower portion of the 

 conducting surface in all three forms are stomata scattered 

 very sparsely, set in a group of special cells. 



Longitudinal Sections of the Rims 



The rim of S. Sledgei is rolled over once in a rather loose 

 turn. The tip is blunt with several thickened cells. The 

 conducting cells appear about halfway round the outward turn. 

 Beneath the conducting cells is a single layer of subepidermal 

 cells. The mesophyl is deep and loose. There are two layers 

 of cells forming a false palisade below the epidermis. 



In S. Drummondii there are two sub-conducting and 3-4 sub- 

 epidermal layers. The mesophyl is loose, especially below the 

 areolations. 



In S. areolata the rim is intermediate. Beneath the con- 

 ducting cells are two layers of subepidermal cells. The meso- 

 phyl is deep and loose especially below the window areas. Be- 

 neath the outer epidermis are three subepidermal palisade 

 layers. 



Detentive Surface 



The detentive surface of S. Drummondii is, as has been de- 

 scribed above, composed of normal straight-walled polygonal 

 epidermal cells. A few normal stomata are scattered over this 

 surface, but no glands are present. Hairs are present, of the 

 normal variety, .8-.Q. mm. long, 3-4 to a field. 



In 5. Sledgei this surface departs from the normal detentive 

 in that some of its cells are wavy walled, with very different 

 contents from those of the detentive epidermal cells. These 

 cells appear only on the upper detentive area in large groups 

 isolated in the midst of characteristic detentive cells. Other 

 cells show all transitions between straight walled detentive 

 surface cells, and isodiametric wavy walled cells resembling 



