ODONTIODA 
The hybridists have evolved a beautiful new genus by crossing species of Cochlioda 
with those of Odontoglossum and plants derived from these crosses are called 
Odontiodas. The Cochlioda species most used are C. Noezliana, C. Vuylstekae 
and C. vulcanica, while Odontoglossums Cooksoniae, Harryman, crispum and 
eximium have been most favoured. 
Treatment as prescribed for Odontoglosswms will suit them, but the Odontiodas 
are .egarded as being more amenable to cultural conditions than the natural species. 
There are now hybrids of three or four generations available. 
ODONTOGLOSSUM 
Practically every species in the genus of epiphytical orchids known as Odonto- 
glossum is a thing of beauty. Unfortunately the cultivation of plants of this 
genus has presented much difficulty in Australia, and the problem of how to grow 
them satisfactorily has not yet been solved. From time to time shipments of 
species and hybrids have been imported by or for growers. Occasionally a plant 
lives for a year or two and sometimes even delights its owner by flowering. 
Almost invariably, however, the plants either fail to grow or else gradually go 
back and finally perish. Experiments made comparatively recently at growing 
these plants out of doors in and near Sydney have given some signs of possible 
success, but it is really too soon to say more than that growing Odontoglossums 
out of doors offers the best chance of satisfactory results. 
The Odontoglots grow naturally in elevations which range between 5,000 feet 
and 12,000 feet above sea-level, and are all found in that stretch of America 
from Southern Mexico down to Bolivia, roughly between the latitudes of 20° N. 
and 15°S. This distribution covers a distance of about 2,000 miles along a 
comparatively narrow strip of country on the Pacific side of the American con- 
tinent. Throughout the whole of this area the climate belongs to the class Aw in 
Koppens classification of climates. Lands with this climate are of tropical tem- 
perature with very little difference between Winter and Summer thermometer 
registrations—that is, they are lands of perpetual Summer. Their particular dis- 
tinction from other tropical lands is that in the Winter their average rainfall is 
less than 2.4 inches for at least one month—but their Summer rainfall is so great 
that even though they have this dry spell in the Winter months, the ground 
remains damp throughout the year, so that the atmosphere always contains a 
high percentage of moisture. 
Although the latitudes in which Odontoglossums grow are all under the tropical 
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