THE ORCHID REVIEW. 
[October, 1921. 
Brit. Ind., v. p. 840). There is at Kew a sheet of dried specimens, collected 
by Griffith, four out of six of which have the above described peculiarity. 
Mr. R. A. Rolfe thought that these tufts of setae replaced the leaf, and the 
course of their development to be a gall-growth, due to insect puncture, but 
- expressed the opinion that observations on the spot would be acceptable. 
These have now been carried out by Mr. Ghose, and we hope he will favour 
•us with some further interesting communications. 
Pleione humilis was discovered by Dr. Francis Buchanan, in Upper 
Nepal, and was first figured and described by Sir James Smith in 1805. It 
was introduced to cultivation by Thomas Lobb, who sent it from the 
Khasia Hills to Messrs. Veitch in 1849. It is also found at Sikkim, at 
elevations of 7,000-8,500 feet, and flowers during February and March. To 
-the European residents of Darjeeling it is known as the Himalayan Crocus. 
Orchid Propagating by Bulbils.— Orchids which propagate by 
bulbils are not common, but the North American Microstylis ophioglos- 
soides seems to come under this heading. A note bv Harriet A. Nye 
(Rhodora, vi., p. 79) states that when preparing a specimen for the 
Herbarium she observed that several bulblets had formed underneath the 
loose outer coat of the bulb, one of them had already sent up a tiny leaf on 
a stem half-an-inch long. 
Colour and Odour of Cape Orchids. —It has long been recognised 
that the colours of Orchid .flowers play an important part in the economy 
- of their fertilisation. Regarding the Orchids of the Cape Peninsula, Mr. 
Harry Bolus, F.L.S., in his book on these plants published in 1888, 
remarks: “ Blue and red flowers have been supposed to be the most 
attractive colours to insects ; yellow and green less so; while white flowers 
are probably most visited by night-moths. It is not always easy to define 
accurately and briefly the colours of Cape Orchids, since they are often 
variously combined in the same flower. I have endeavoured to arrange 
them in groups as to their predominant colours, with the following results : 
* Green, 9 species ; yellow, 32 ; brown, 8; red, 24; blue and blue-purple, 
14; white, 16. Liparis has green flowers; Eulophia, brown, yellow, and 
white; Bartholma, purple and white; Satyrium, all colours named above, 
-except blue; Disa, all the colours named above; Dispersis, red, yellow, 
.and green ; Corycium, yellow and white ; Pterygodium, yellow and purple ; 
Ceratandra, yellow, white, and red. With respect to the odours exhaled 
by the different species, it is noticeable that, speaking generally, those of 
red hues are the least fragrant; those with white flowers most so. The scent 
of some (chiefly species with yellow flowers, as Corycium orobanchoides 
Pterygodium catholicum, &c.), is often heavy and unpleasant.” 
