Sarracenias with that of Their Parents 15 



to the end of the projection. S.flava has a long, fine tip (PI. V, 

 fig. 23) and the cell measures .07 mm. in length. The upper 

 portion of the conducting surface of S. Catesbaei shows an ex- 

 actly intermediate size .06 mm. (PI. V, fig. 24). These cells 

 are all beautifully thickened with striae, as are the lid hairs. 



L. S. Pitcher Rim 



A longitudinal section through the rim of the pitcher men- 

 tioned above shows an interesting relation. In S. purpurea 

 the rim is rolled outward and under, in two turns. In S. flava 

 the rim is rolled over once, rather loosely. 5. Catesbaei is 

 rolled over, and slightly curved around again, or is rolled once 

 and half. 



The tip region in S. purpurea has three layers of thickened 

 cells, while in S. flava the whole tip region is thickened. 5. 

 Catesbaei shows about an intermediate amount of thickening. 



The conducting cells, with their fine processes, do not begin 

 to show in S. flava at the tip, but considerably below the tip 

 on the outwardly rolling portion. 



Below the conducting cells in 5. purpurea there are two layers 

 of thickened cells, closely united to each other and to the epi- 

 dermis. In S.flava there is but one such layer. In S. Catesbaei 

 there is one regular continuous layer adjoining the epidermis, 

 and a second discontinuous layer below it. The mesophyl in 

 5. purpurea is loose, with large thin-walled cells. S. flava has 

 a more compact and more shallow tissue than in 5. purpurea. 

 The mesophyl in 5. Catesbaei is not so loose as that of S. pur- 

 purea, nor so compact as that of S. flava. 



The outer epidermis in all three forms is composed of thin- 

 walled cells. The stomata have their guard cells raised above 

 the level of the epidermis in all three. 



Below the outer epidermis is a region of regular large, thin- 

 walled cells closely applied to each other. These cells form 

 a false palisade tissue in the pitchers. In 5. flava there are 

 3-4 layers of these cells; in S. purpurea 2-3 layers; in S. Cates- 

 baei there are 2 layers. These cells contain numerous chloro- 

 plasts, and form a continuous layer, except where interrupted 

 by stomatal chambers. 



In S. purpurea, below the narrow conducting surface there 

 is a wide expanse of glandular surface, reaching down to the 



