74 



orilRE.E. 



Chai'. II. 



mentarv tail. 



Fis. 12 



In fig. 



attaclied, and there is hardly a vestige of the rudi- 



12 the discs of both species, 

 of the proper proportional 

 sizes, are represented as seen 

 vertically from above. The 

 poliinia, after removal from' 

 their cells, undergo nearly the 



,. TV . ,1 zi ,, same movements as in the last 



li. Disc anil c-mdicle (pt H. ch/o- 



rantha, seen from above, SpCcicS. Ill both fomiS the 



with the drum-like pedicel movement is Well shown 1)V 



lore-.shortened. 



A. Disc and caudicie of //. hi- removing a jiolliuium by the 



/o^ij, seen from above. +l,," u ^,,^1 ,..;-»-l • £■ 



^ tliick end with a pair ol pin- 



cers, and holding it nnder the microscope, when the 

 plane of the viscid disc will be seen to move through 

 an angle of at least forty-live degrees. The caudicles 

 of the Lesser Butterfly Orchis are relatively very much 

 shorter than in the other species; the little packets 

 of pollen are shorter, whiter, and, in a mature flower, 

 separate much more readily from one another. Lastlv, 

 the stigmatic surface is differently shaped, being more 

 plainly tripartite, with two lateral prominences, situ- 

 ated beneath the viscid discs. These prominences 

 contract the mouth of the nectarv, makin2: it sub- 

 quadrangular. Hence I cannot doubt that the Ijarger 

 and Lesser Butterfly Orchids are distinct species, 

 masked by close external similarity.* 



As soon as I had examined the present species, 



* According to Dr. II. ^MiiJler, 

 lIulxiKin'n or riatantlura hijuUa 

 of luiulisii authors is tlie P. sul- 

 stitialis of Bueiiiiiiighausen ; iiiul 

 lie fully agrees with mc that it 

 mii.-<t be ranked as siucilically 

 distinct from P. chlorantha. Dr. 

 Miillcr states that this latter 

 species is connected by a borits 

 of gradations with another forji 



which in Germany is called F. 

 hifolia. He givis a very full ami 

 interesting account of the varia- 

 bility of these three forms of 

 I'Idtanthera, and of their structure 

 in rilatiou to their manner of fer- 

 tilisation : 'Verliandl. d. Nat. 

 Vereiu. f. I'r. Kh. u. Wcsifal.' 

 Jfthrtr. XXV. III. Folge, v. Bd. pp. 



