Chap. 111. 



PTEROSTYLIS LONGIFOLIA. 



-Si 



which is thus temporarily imprisoned within the other- 

 wise almost completely closed flower. The labellum 



Ficr. 14. 



v*'^*** ^< 



♦ /» t I 



rxKROSTYLlS LONGIFOLIA. (Copied from Mr. li. D. Fitzgerald's 'Australian 



Orchids.') 



A. Fldwpr in its natural state : the 



outline of the column is dinily 

 seen within. 



B. Flower with the near lateral 



j)etal removed, showing the 



column with its two shields, 

 and the labellum in the position 

 which it occujiies after having 

 been touched. 



remains shut from half an hour to one hour and a 

 half, and on reopening; is again sensitive to a touch. 

 Two membranous shields project on each side of the 



