160 



VANDE^. 



Chap. IV. 



which is shown closely attached to the rostellum in 

 the accompanying figure A. 



Fig. 25. 



POLUNICM OF Ornitiiocephalus. (From a sketch by Fritz Muller.) 



A. Pollinium still attached to the I 



rostellum with the pollen- I 



mass still lying in the cli- ! 



nandrum on the summit of j 



the column. I 



B. Pollinium in the position which ] 



it first assumes from the elas- 

 ticity of the pedicel. 

 C. Pollinium in the position ul- 

 timately assumed from th<! 

 hygrometric movement. 



The pedicel when freed suddenly bends into the 

 form represented at B, and soon afterwards owing to 

 the hygrometric contraction curls up into the odd 

 figure shown at C. When placed in water it resumes 

 the form represented at B. 



