16 THE ORCHID REVIEW. [JAN.-FEB., 1919. 
brown centre. Its presence on Ornithidium does not appear to have been 
recorded, but the general character is so similar to Oncidium that there is 
" nothing improbable in it, and as the plant affected has been long in the 
collection it is practically certain that it has spread from something else. 
The history of the fungus suggests Brazil as its place of origin.— 
R. A. ROLFE. 
HEMILEIA AMERICANA, MAssEE.—The above note raises the question of 
the identity of the host plant of Hemileia americana, Massee$ whose history 
has previously been summarised (O.R., xiii. p. 267). It was originally 
recorded by Mr. Massee as Oncidium Cavendishianum, but in a later article 
on the genus Hemileia it is recorded as Cattleya Dowiana (Kew Bull., 1916, 
p- 40, with plate, fig. 7-11), no mention being made of the Oncidium. 
Curiously enough, it is a Cattleya leaf that is shown in the original article, 
and which is preserved in the Herbarium, while the fungus shown seems 
identical with the later figure. It thus remains to ascertain the identity of 
the parasite fungus which affects Oncidium Cavendishianum, and whether 
the two fungi are really distinct. H. Oncidii was then unknown, and when 
more material is forthcoming it may be possible to see how far the smaller 
‘spores are a reliable differential character. We shall be much obliged if 
anyone who finds a fungus upon this or any other Oncidium will forward 
examples, which may serve to clear up the doubtful point. It is not a very 
destructive pest.—R.A.R. 
CypRIPEDIUM Tom WorsLey.—A flower of this beautiful hybrid, which 
is descended from C. Helen II. and Actus langleyense, is sent from the 
collection of Tom Worsley, Esq., Carter Place, Haslingden, by Mr. T. Wood. 
who remarks that it is a lovely thing and quite unique. He adds that they 
have now quite a batch of it in bloom, giving a distintive feature to the 
house. The shape is excellent, and the ground colour of the broad. petals 
and lip light yellow, the former having a light brown central line and several 
rows of small dots, mostly on the upper halves, The dorsal sepal is slightly 
concave, white, with a light greenish yellow base, and numerous small 
blotches and spots in the centre, those which extend into the white area 
being light purple in colour. The flower bears a strong general appearance 
to C. insigne, which species, or its yellow variety Sander, was concerned 
_ In each of the crosses concerned in its descent. 
has given the yellow colour. 
the influence of C. Spicerianum. It is 
received a First-class Certificate from th 
March, 1916. 
certainly a charming thing, and 
e Manchester Orchid Society in 
