104 



been registered elsewhere, we thought it worth while to sub- 

 ject the Buitenzorg material to a close examination. 



Chiefly we have had to do with pseudo-dimery as described 

 repeatedly by us in Clrammatophyllum speciosum and charac- 

 terized by coalescence of the lateral sepals with suppressed 

 labellum. In his „Anomalie3 des Orchidees" Penzig has pointed 

 out how deceitful the resemblance can be between pseudo- 

 dimery and regular dimerous pelory. In both cases there are 

 two sepals with alternate petals, and a two-celled ovary, so 

 that the difference between the two flowers can only be deriv- 

 ed from the presence of a labellum, or if this be absent, from 

 the inferior sepal. In many cases this sepal betrays its compound 

 state and makes the difference clear, but it may also happen 

 that the coalescence is so complete and the product so much 

 like the opposite sepal as to render a distinction absolutely 

 impossible. 



The following cases have come under our observation: 



a) Flower dimerous. Upper sepal normal, lateral ones grown 

 together to a whole, opposite to and quite like the upper one. 

 Petals normal and alternate with the sepals. Lamina of the 

 labellum represented by a very small s-shaped grooved lobe; 

 spur none. Ovary grooved, laterally compressed, two-celled. 

 (Fig. 7.) Pseudo-dimery. 



b) Upper sepal normal. Lateralones grown together to a whole 

 like the upper one. It shows, however, at the back two long- 

 itudinal ribs and at the front two unequal projecting edges. 

 One petal normal, the other (left) irregularly broadened towards 

 the double sepal; this broadened portion is somewhat folded 

 and pale orange, at its base cohering with the tube of column 

 and labellum-stalk. The column bears on the other (right) side 

 a small, irregularly folded, pale orange appendage. For the 

 rest nothing of a labellum is to be seen. Ovary grooved, 

 laterally compressed. Edges on the lateral sepals (fig. 8). Pseudo- 

 dimery. 



c) Upper sepal normal. The lateral coalesced, at the inner- 

 side with two irregular edges. Petals normal. Labellum repre- 



