NOVEMBER, 1910. ] THE ORCHID REVIEW. 325 
which when touched cause. the ejection of the pollinia, sometimes to a 
considerable distance.: In the female the column is short and stout, and 
without. antennz. In some of the species only one of the antennz is 
sensitive, the other being turned round near the base of the column and 
functionless. . This section contains twenty or more species, C. macrocarpum 
and C. maculatum being familiar examples. 
’ The section Myanthus is the largest of the four, and contains a very 
varied assemblage of species. The females have a galeate superior lip, and 
closely resemble those of Eucatasetum, but the males have the lip under- 
neath, and variously expanded, lobed and fringed, but never galeate. 
C. fimbriatum, callosum, and barbatum are familiar examples, and these 
all have two equal antennz, which are both sensitive. In another set the 
antenne are in different planes, as in Eucatasetum, one being functionless. 
This set contains C. tabulare, Bungerothiiand Christyanum. The diversity 
between the two sexes is remarkable, and in a large number of species the 
female flowers are still unknown. 
Cycnoches has also unisexual flowers. It is a small genus of about 
sixteen species, differing chiefly from Catasetum in the structure of the lip 
and column, the latter, in the males, being elongated and curved, 
resembling the neck of a swan, whence the name was derived. In the 
females the column is much shorter. There are two sections, Eucycnoches, 
in which the lip and perianth are similar in the two sexes, as in C. 
chlorochilon and -C. Loddigesii, and Heteranthe in which the females 
resemble those of the other section, but the males are much smaller, with 
very membranous perianth, and the lip broken up into a small disc with 
numerous marginal clavate teeth. This set contains about ten species, of 
which C. maculatum and C. Egertonianum are familiar examples. The 
history of the genus was given in our last volume (pp. 269-272). 
(To be continued.) R. A. ROLFE. 
THE DISSEMINATION OF INDIGENOUS ORCHIDS IN 
BEL 
‘A very interesting paper by M. J. Houzean de Lehaie, entitled ‘‘ Obser- 
vations pour servir a l'étude de la dissémination des Orchidées indigénes en 
Belgique,” has just appeared (Bull. Soc. Roy. Bot. Belg., xlvii. pp. 45-52). 
About ten years ago the author re-afforested a plot of land of about 30 acres, 
at St. -Symphorien, near Mons. This land, which consists of old quarries, 
has a very diversified surface, and the soil consists of compact sandy clay, 
with considerable deposits of waste calcareous matter. The land has been 
planted for effect, with numerous glades, and some of the trees are now 30 
to 40 feet high. The planting was arranged so as to provide a broad belt 
to break the winds from the east and north, at the same time affording free 
