1879. ] 
ODONTOGLOSSUM YEXILLAIUUM. 
131 
OD0NT0fiLO.S!3UM VEXILLAEITTM. 
[This lovely Orchid varies in the colour of its flowers from the faintest blush to the deepest rose.] 
G5°, summer or winter ; neither can it endure 
a close atmosphere. Nearly all the failures in 
the attempted cultivation of this most beauti¬ 
ful Odontoglot have been brought about by 
keeping the plants in a close atmosphere. It 
recjuires as much air as any intermediate stove- 
plant ; and if placed in a shady part of the 
house, will grow as freely as other stove-plants. 
The material which seems best suited to its 
root requirements is good fibry brown peat, 
broken up to about the size of small walnuts, 
mixed with sphagnum moss, and with a dash 
of coarse silver sand; this placed over a very 
liberal drainage of potsherds broken small. 
Odontoglossums should never be potted in 
hot weather. The latter cud of October is about 
K 'I 
jV 
