264 



OUTLINES OF PLANT LIFE. 



cases the softer parts of the insect bodies are digested and 

 absorbed. It should be noted, however, that adhesive sur- 



FiG. 222. B Fig. 223. 



Fig. 222. — A bladder of Utric-ularia vulgaris, halved lengthwise, with an imprisoned 

 cnistacean, Cyclops, a to b, opening, with hairs, /?, /, about it; ^ to c, cushion-like 

 rim, b-c part cut through, d-e surface on which the flap, f, rests, opening inwards 

 only ; g, wall of bladder set with absorbing hairs within and glandular hairs without ; 

 k, the stalk (secondary petiole). Magnified 20 diam. — After Cohn. 



Fig. 223. — Two leaves of sun-dew {Drosera rotundi/olia). A, in expanded position 

 showing the tentacles B, shortly after the capture of an insect. The tentacles on the 

 right half are inflexed to bring the glandular tips in contact with the prey. Magnified 

 2i diam. — After Kerner. 



faces are also merely protective against the visits of unwel- 

 come guests, who steal nectar or pollen. (See T[ 394.) 



375. 3. By move- 

 ments of traps and 

 adhesive surfaces. — 

 Somewhat more com- 

 plex methods of cap- 

 ture are exhibited by 

 leaves which have 

 special movements 

 connected with traps 

 or sticky surfaces. 



Fig. 224. — Cluster of leaves at the base of flower-stalk 

 of Venus' fly-trap {Dianxa muscipula). One-half The SUndeW of OUr 

 natural size. — After Drude. 



swamps has the edges 

 and surface of the leaves covered with many outgrowths, 



