January, 1906.] THE ORCHID REVIEW. 7 
From June to November the rains are frequent and copious, though 
there is plenty of sunshine at intervals, and a breezy air, from November 
on until February, much cloudiness and mists, the extremes of temperature 
ranging from 58° to 80° F, though for most of this period from 65° to 
75°; and during the rainy season the range is from 75° to pba 
rhe Orchids of the” district comprise 
2 fordi E i E. ciliatum, E. atropurpureum, two 
PA I. 
f 
fine species of Stanhopea—distinet from our Sierra plants, S. tigrina and 
o. oculata—Oncidium luridum, O. altissimum, O. Cebolleta, Cycnoches 
la giauca, Schomburgkia tibicinis, Coryanthes sp., 
Mormodes sp., and an epiphytic Sobralia with similarly coloured but 
smaller flowers than S. macrantha, which latter occurs at not lower than 
4,000 feet, and always semi-terrestrial. 
Schomburgkia is never found here in tall, damp forests, but always in 
more or less open country, oH often sadly sunburnt but very floriferous. 
The Stanhof and Epid hl occur in shady places, and 
the others generally in more airy situations, and exposed to partial sun~- 
light. Besides those enumerated, there are many others, few of which are 
of other than botanical interest. 
Cycnoches, Catasetums, and Mormodes almost invariably grow either 
in rotten stumps or the decayed portions of live trees, very rarely in live 
bark, and, so far as I have observed, are the only Orchids of the district 
affecting this preference. 
The symbiotic relation between the roots of different Orchids, and the 
bark of the trees in which they grow forms a most interesting study, and 
the effort to collect from the forest and establish the plants in our garden 
trees becomes at times a problem. On certain trees the plants languish 
for no apparent reason, in others the results are most gratifying. 
An exfoliating cortex is obviously unsuitable ; hypothetically, a rough 
bark would promise the greater measure of success, and often so results, 
yet many Orchids taken from trees with a bark of this character find a 
happy home in the comparatively smooth bark of young Mango trees, and 
I have observed Schomburgkia tibicinis growing on the very smooth trunks 
of Oreodoxa regia, the royal palm, though more commonly in the rough 
bark of a species of Quercus, found in open, atenet® country, near the 
coast as well as inland. 
Of the many Orchids I have collected in the Sierras, from 4,000 to 
6,000 feet, few succeed at this low elevation. Oncidium Cavendishianum, 
however, does fairly well, also O. ornithorhynchum and - Trichopilia 
tortilis. 
J. €. Harvey. 
Santa Lucrecia, Mexico. i 
