SEPTEMBER, 1912.] THE ORCHID REVIEW. 267 
by 13 inches broad, while the lip measures 3+ inches long, and the base 
and apex are white, with some clear red-purple in the throat, sharply defined 
below, and not extending far into the white area above. The lip and petals 
are broader and much shorter than ‘in the preceding variety, and the petals 
are flatter and more expanded, while the purple in the throat is much lighter 
in colour, and covers a smaller area, leaving more white at the much reflexed 
apex. The two are really very distinct, both in shape and colour, and the 
differences can be appreciated when one can compare them side by side. 
The Walton Grange variety has been used for hybridising, being the 
seed parent of the beautiful Lzliocattleya luminosa aurea, raised in the 
collection of Lt.-Col. Sir George L. Holford, K.C.V.O., which received a 
First-class Certificate from the R.H.S. in October, rg11 (O.R., xix. p. 342), 
in which the yellow colour of the sepals and petals has been largely per- 
petuated, with an improved pret owing to the influence of Cattleya 
Dowiana aurea. 
PF ls tee 
LEAF SPOT OF ODONTOGLOSSUM. 
I AM interested in your remarks about Orchid Spot in the last issue of the 
Orchid Review (page 239). I have only a house of Odontoglossums here, 
where I grow some 500 plants, and I have noticed during the last two 
months that several of them have behaved like your correspondent’s Lezelio- 
cattleyas. I observe that, in my case, the spot always occurs on one of the 
old leaves—none of the new growths nor the leaves on the last bulb being 
affected. My house has sunshine from the East and South (shaded, of 
course, with blinds), and I ventilate freely, both top and bottom. I thought 
it might be caused by overwatering during the recent hot days, so I am 
keeping them now on the dry side, but I am also wondering whether we 
are about to find that we can have too much osmunda fibre in the potting 
material, which, in the second year, decays so much that it is practically 
reduced to a mould, and unless we repot annually we shall have trouble, as 
we did years ago when using too much Belgian leaf-soil. I send you three of 
the diseased leaves, and may say that I have about twenty-five. plants affected. 
Hove, Sussex. H. NYE. 
It has often been remarked that the spot disease of Orchids is due to 
some cultural defect, but in the case or Odontoglossums it is sometimes 
caused by a definite parasitic fungus. About six years ago, when I was at 
Burford, there was a disease among the Odontoglossums, which affected 
the leaves, forming black blotches on the under surface, but it only 
appeared spasmodically, and was easily kept in check by cutting off the 
worst infected leaves and sponging any others on which small blotches 
appeared. I sent some affected leaves to an expert, who had done some 
