ECOLOGY 623 
When examined under the microscope each tentacle shows a 
slender pedicel terminating in a gland. A conducting bundle 
containing spiral vessels and simple vascular cells is observed to 
come off of a fibrovascular bundle in the leaf-blade and run 
Fic. 473.—Drosera rotundifolia, the Round-leaved Sundew. (From Jenkins’ ‘Inter- 
esting Neighbors.’’) 
through the center of the pedicel to the gland. Upon entering 
the gland it is enlarged and spread out into a number of tracheids. 
These centrally placed tracheids are surrounded by a protective 
sheath (endodermis) outside of which are two layers of secretory 
(epidermal) cells with wine-red, granular contents, the outer 
layer of which is palisade-like. These glands are commonly oval 
excepting the extreme marginal ones which are considerably 
