Chap. VI. MOVEMENTS OF THE rOLLlNIA. 159 



water, after both movements had taken phice ; and 

 the pedicel then moved into the same position which 

 it had at first assumed through its elasticity ; this 

 movement not being in any way affected by the 

 water. When taken out of water the hygrometric 

 movement of depression soon commenced for tlie 

 second time. 



In Bodrigiiezia secunda there was no hygrometric 

 movement of depression in the pedicel as in the before- 

 mentioned R. suaveolenSy but there was a rapid down- 

 ward movement, due to elasticity, and of this I have 

 seen no other instance ; for when the pedicel was put 

 into water it showed no tendency to recover its original 

 position, as occurred in many other cases. 



In Phal^nopsis grandifiora and amahilis the stigma 

 is shallow and the pedicel of the rostellum long. 

 Some compensating action is therefore requisite, which, 

 differently from that in Maxillaria ornitJwrhyncJia is 

 effected by elasticity. There is no movement of de- 

 pression ; but, when the pollinium is removed, the 

 straight pedicel suddenly curls up in the middle, thus 

 ( — '^— ■ ) : the full-stop on the left hand may re- 

 present the balls of pollen, and the thick hyphen to 

 the right may be supposed to represent the triangu- 

 larly shaped disc. The pedicel does not straighten 

 itself when placed in water. The end carrying the 

 balls of pollen is a little raised up after this elastic 

 movement, and the pedicel, with one end raised, and 

 with the middle part upwardly bowed, is well adapted 

 to drop the pollen-masses into the deep stigmatic 

 cavity, over a ledge in front. Fritz Midler informs 

 me of a case in which the shortening of a very long 

 pedicel is effected partly by elasticity and partly by a 

 hygrometric movement. A small Ornithocephalus, 

 growing in South Brazil, has a very long pedicel, 



