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SEXUAL FOBMS OF CATASETUM. 



225 



precisely identical:with those of the preceding sections. Although 

 I was able to examine living flowers, I could not satisfy myself 

 whether any portion of the column was sensitive. I touched it in 

 several places, somewhat roughly at last, but without producing 

 the slightest effect. But when at length I brought the anther-case 

 away by force the stipes of the pollinia was seen to be curved 

 round a protuberance on the face of the column, and being liber- 

 ated it immediately straightened itself; and I suspect that when 

 the flowers are in the proper state of maturity the function of 

 this elasticity is to help in ejecting the pollinia. Here is a case 

 for future observation ; but I have noticed in one or two instances 

 in the preceding sections that the flowers are not equally sensitive 

 at all limes. Whether this depends upon the proper stage of 

 maturity being reached, or upon the temperature, or whether it 

 is that some species are more sensitive than others, I do not at 

 present feel satisfied about. Further observations are necessary 

 to decide the point. 



The following species belong to this section : 



C cassideum, Linden Sf Beichb.f. 



C. discolob, Lindl. (Monachanthus discolor, Lindl., M. fim- 

 briatus, Gardn., M. Bushnani, Hook., C. roseo-album, Hook.). 



C. LONG1FOLTUM, Lindl. 













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DESCRIPTION OF PLATE VIII. 



Fig. 1. Plant, showing the male and female inflorescences on cither side of the 





same pseudo-bulb ; £ nat. size. 

 -. A portion of male inflorescence; nat. *\ze. 



3. Lip of male ; x 2 diani. 



4. Column of ditto, showing the antenna- ; X 2 diiun. 



5. Anther-case, front view ; X 3 diani. 



6. Pollinia, with stipes and gland, back view ; X 2 diani. 



7. The same, front view ; X 2 diam. 



8. A portion of female inflorescence ; nat. size. 







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