DECEMBER, 1916.] THE ORCHID REVIEW. 283 
an ordinary petal, the shape, texture, and colour being equally exact, while 
the lateral sepal and the angle of the column on the same side of the flower 
are missing. The anther and pollinia are normal. The peculiarity seems 
to be due to the suppression of one of the vascular bundles, and is probably 
accidental.—ED. | 
aces AN ORCHID FUNGUS. Ory 
PARASITIC Orchid Fungus that was found ona species of Oberonia 
has been sent to Kew for determination from the Royal Botanic 
Garden, Glasnevin, and Sir Frederick W. Moore-remarks. that he has seen 
it several times before, and that it is very injurious. It takes the form of 
small dark pustules, from which, on reaching maturity, small orange- 
coloured spore-masses escape, which, under a lens, somewhat resemble 
minute elongated grains of sand. It has been identified by Miss Wakefield 
as Colletotrichum Orchidearum, Allesch., a species described some fourteen 
years ago from specimens found on various Orchids in a warm house in the 
Munich Botanic Garden. Forms are recorded as occurring on Cymbidium 
pendulum, Physosiphon Loddigesii, and Eria stellata, these being 
distinguished respectively as forma Cymbidii, Physosiphonis and Erie, but 
as the Glasnevin example occurs on Oberonia it is doubtful if these names 
have any significance. The wild source of the fungus appears to be 
doubtful. 
Six other species of Colletotrichum have been described as parasitic 
upon Orchids, namely, C. Vanille, Scalia, found on Vanilla “‘ odorata ’’— 
presumably V. planifolia—in the Botanic Garden of Catania, Sicily; C. 
roseolum, P. Henn., found on dead pseudobulbs of Stanhopea oculata in 
the Berlin Botanic Garden; C. Dichez, P. Henn., found on Dichea at 
Berlin; C. effiguratum, Syd., found on Paphiopedilum Roezlii at Berlin ; 
C, macrosporum, Sacc., found on the leaves of epiphytic Orchids in Brazil; 
and C. Orthianum, Kostlan, found in the Orchid house of F. Bluth, at 
Berlin. This latter is said to have occurred on Cypripedium insigne, 
Ccelogyne cristata, Dendrobium nobile, and Vanda ccerulea, and is the 
subject of an elaborate monograph with three plates, which we have not 
seen. It is said to be marked by the variability of its spores, and Magnus 
in a notice of the paper (Bot. Centralbl., xcix., p- 423), suggests that both 
this and C. roseolum are probably the same as C. Orchidearum. 
It would be interesting if Orchid growers would: keep a watch for 
additional materials, particularly on recently imported plants, and forward 
any that they may observe, for it is pretty clear that our knowledge of 
the subject is still very imperfect. R.A.R. 
