THE ORCHID REVIEW. 251 
Calanthes are all spotting ; some disease has attacked them. My plants of 
Peristeria elata have also become spotted, and the growths have stopped 
prematurely. The Cattleyas which flowered so well during early summer 
are fast decaying in the bulbs, and some of them have become quite putrid. 
Many other plants also are showing signs of going wrong. What can be 
the cause of it?” I suggested that it might be caused by dispensing with 
fire heat, combined with too much water at the root and in the atmosphere. 
If not this, what could it have been ? 
ORCHID GROWER. 
[We take it that our correspondent only alludes to the occupants of the 
warm house, and it would certainly be interesting to know how far 
artificial heat may be dispensed with during spells of warm genial weather, 
for only then could artificial heat be safely dispensed with. A safe guide 
would perhaps be not to let the temperature fall below a certain minimum 
in any house, and only to dispense with fire-heat when the outside 
conditions permit—a rule which would apply equally well to Cool Orchids. 
But what this minimum may be in the case of the warm house, and how far 
our variable climate permits of artificial heat being dispensed with, are 
matters respecting which other correspondents may be able to give us the 
benefit of their experience.—ED. | 
ONCIDIUM TETRACOPIS. 
This is a very handsome species of the rambling O. macranthum group, 
which was exhibited by Welbore S. Ellis, Esq., at the meeting of the Royal 
Horticultural Society, on June 11th. It is very rare in cultivation, but at 
least two or three other plants are known. It was described by Reichenbach 
in 1873 (Gard. Chron., 1873, p- 915) from dried flowers sent from New Granada 
to Mr. Bull by Senor Baldeviama. Some living plants were also introduced, 
which ultimately flowered in the collection. It also flowered m the collec- 
tion of H. R. Mark, Esq., of Beckenham, in 1890. In 1892 it was again 
discribed as O. chrysodipterum (Veitch Man. Orch., vill, PP 23» 24> with fig), 
from a plant which flowered at Chelsea, and which had been acquired at 
one of the London sales in the previous year. This plant passed basic the 
collection of the Hon. F. L. Ames, at North Easton, Mass., U.S.A. ‘it 
bearsa considerable resemblance to O. superbiens, Rchb-f., put is most allied 
to O. trifurcatum, Lindl., and O. cryptocopis, Rehb.f., which if now in culti- 
vation, must be exceedingly rare. The latter is figured at a 5858 of the 
Botanical Magazine. There are quite a number of imperfectly ani ag 
in this curious group of Oncidiums, to which Lindley gave the name 0 
Microchila, on account of the small lip. ok RK. 
