COHESION AND SUPPRESSION. 



245 



exactly similar to each other, belonging to the outer 

 whorl ; the extra one must, therefore, have arisen 

 from fusion of the anterior stamens A^ and A', after 

 these had become abnormally resurrected in the form 

 of staminodes. Stamens o? and a' of the inner whorl 

 were normal, but situated exactly at right angles to 

 the staminodes and opposite the petals. The usually 



Fia. 14:8.— Ccelogyne cristata. Dimerous flower. (From the 

 ' Gardeners' Chronicle/ 1903.) s, sepals ; p, petals. 



trilobed stigma had become a square one, doubtless 

 representing the two apical stigmas of a bicarpellary 

 pistil alternating with the stamens a^ and a^ ; the 

 ovary was single-celled and devoid of ovules. The 

 most interesting feature of this flower was the appear- 

 ance of an extra staminode in order to complete the 

 symmetry of the flower,- this being the only case of 

 " positive dedoublement " ; in all other whorls the 

 structure had either remained in statu quo or else 

 " negative dedoublement " had occurred. 



