228 THE ORCHID REVIEW. [AUGUST, r912. 
similar to that of the more specialised genera of the same tribe. The 
anther has now become completely adnate to the top of the column, and the 
position of the caudicle and gland basal, changes which are clearly cor- 
rellated with the specialised structure of the anther, which has been already 
described. A great development of the rostellum is seen in the Ophrydez. 
In Orchis and Ophrys the glands of the pollinia are enclosed in membranous 
rostellar pouches, which rupture the moment the rostellum is touched by an 
insect inserting its proboscis into the spur of the lip, and the viscid 
glands are at once firmly attached to its head. In Habenaria and its allies 
the rostellum is three-lobed, and the side lobes are elongated into narrow 
channels, which form carriers for the slender caudicles of the pollinia ; while 
in the subtribes Diseze and Coryciez it is also of a highly complex nature, 
and is intimately associated with the removal of the pollinia by insects. 
Other complexities, such as the extension of the stigma into two clavate 
processes in Habenaria and Bonatea, the division of the petals in the same, 
the modifications of the perianth, the various forms of cohesion between its 
members, the double spur of Satyrium, the union of the lip and column in 
the Coryciez, the lateral expansion of the connective of the anther in 
Diplomeris, and others, by which the anther is so profoundly divided as to 
have been mistaken for two; these and other modifications have already 
been pointed out. 
The vegetative developments of the Ophrydez are much fewer than in 
the Neottiee. They are terrestrial plants, mostly with a general resem- 
blance to the familiar genus Orchis. The rhizome usually forms a distinct 
tuber, from which the next year’s growth is produced, after which the old 
tuber shrivels up and disappears. The stem is simple, leafy at the base or 
throughout, and bears a simple terminal spike or raceme, which dies down 
after ripening its seed. With the exception of Habenaria, which is widely 
diffused through the tropics, the majority are natives of subtropical or tem- 
perate countries, with a marked climatic difference between the seasons, to 
which their deciduous character may be attributed. Even the tropical 
representatives, including the large and widely diffused genus Habenaria, 
are often found where there are marked climatic variations between the 
seasons, due to periodicity in the rainfall. R. A. ROLFE. 
(To be concluded). 
DENDROBIUM MONOPHYLLUM. 
A pLanT of this distinct and remarkable Australian species was exhibited at 
the recent Holland House Show by Sir Jeremiah Colman, Bart., Gatton 
Park. It is a native of Queensland and New South Wales, and was 
described by F. Mueller, in 1859 (Fragm. Phyt. Austral., i. p. 189), from 
specimens collected at Moreton Bay by W. Hill. It had been collected in 
Sa SEVERE ST aE 
