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 3 and A 3 , after 

 these had become abnormally resurrected in the form 

 of staminodes. Stamens a 2 and re 3 of the inner whorl 

 were normal, but situated exactly at right angles to 

 the staminodes and opposite the petals. The usually 



Fig. 148. — 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 2 and a 3 ; 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. 



