142 THE ORCHID REVIEW. 
C. scurra. The male flowers have no antenne, yet in C. Russellianum, the 
only one I have been able to examine carefully, the column is sensitive. 
When a particular part of the face is touched the stipes of the pollen 
immediately drop down, and the gland would inevitably become fixed to 
the back of any insect which had caused the disturbance. The lip is 
underneath, asin Myanthus. The females-in this section are unknown, 
but they certainly occur, for the known flowers are male only. 
The fourth section is called PskUDOCATASETUM, and includes the — 
familiar C. discolor, C. longifolium, and the rare C. ciliatum. C. roseo- 
album is scarcely more than a variety of the first named. This group was 
formerly a mystery, and as only one kind of flower was known, and the 
column was short and without antennz, I had wrongly supposed the flowers 
to be hermaphrodite. After the appearance of my paper, Mr. E.S. Rand, 
of Para, wrote to say that C. discolor produced a second kind of flower, 
probably the female ; though no specimens were sent. In 1886 M. Barbosa 
Rodrigues also found an inflorescence of each kind on the same plant, and 
made a coloured drawing, which I have only recently seen. Four years 
later Mr. Jenman found the same thing in British Guiana, and sent speci- 
mens to Kew, in one case the two kinds being on the same raceme. And 
now Mr. Rand has sent a male and female raceme of C. ciliatum, which 
were produced on the same pseudobulb. It is therefore certain that the 
flowers of this group are unisexual, like the rest of the genus. The male 
flowers of C. discolor are well known, and have a galeate superior ciliate 
lip, and a short column without antenne. The stipes of the pollen is 
strongly curved round a protuberance on the face of the column, and the 
gland tucked away in a cavity underneath, which, strange to say, leads 
right into the ovary. As I found it impossible to cause the ejection of the 
pollen by irritating the column, even on probing the cavity, I cut away the 
lip, which was in the way; but still without result. But, on introducing a 
fine wire with a curved point and gently turning it so as to touch the gland, 
the stipes instantly sprang forward and straightened itself. If an insect 
had inserted its tongue into the cavity, the result would have been the 
same, and the gland must have been attached to its body, and thus been 
carried off. And this, I believe, is what takes place. The female flower is. 
twice the size of the male, but similar in general appearance. The column, 
however, is very stout, as in other females of the genus, and without any 
trace of the protuberance or cavity on its face, while the stigma is present 
and the pollen abortive. The female of C. ciliatum is very similar, and I 
now suspect that the mysterious C. cassideum (Lind. and Rchb. f. Xen. 
Orch., li., p. 171, t. 170, fig. 6) is the female of one of these-two species. It 
would be interesting to know which grows on the Rio Negro. The female 
of C. longifolium is still unknown. It is very remarkable that the female 
of..G. discolor has not been detected before, as it is frequently seen in 
