174 FUNGOID PESTS OF CULTIVATED PLANTS. 



It is not clear that this species has been found in this country, since 

 the suspicion that the species found on Orchids at Glasgow was the same 

 is without good foundation, the size of the sporules being different, and, 

 as far as can be ascertained, the pustules in the above species are not 

 produced upon bleached spots. 



Neither, again, can the more recent Orchid Anthracnose be referred to 

 this species, which we have called here Glceosporium Bidgoodii, since the 

 external appearance and fruiting appear to be different. 



Sacc. Syll. iii. 3765 ; Journ. E.H.S. xxvi. 1902, p. 729, fig. 305. 



OTHER ORCHID ANTHRACNOSE. 



As this seems the most fatal spurce of Orchid disease, we may enumerate 

 the known species of Anthracnose found on Orchids. 



MALAGASY ORCHID ANTHRACNOSE. 

 Glceosporium pallidum (Karst.). 



This species was found on the leaves of Orchids from Madagascar 

 cultivated in France. The pustules are pallid, and not blackened as is 

 often the case, and the conidia oblong, straight, and obtuse at the ends 

 (10-16 x 3-6 p). 



Sacc. Syll. x. 6816. 



MEXICAN ORCHID ANTHRACNOSE. 

 Glceosporium Orchidearum (Karst.). 



In this instance the pustules are covered with the blackened cuticle, 

 which is split longitudinally to allow the conidia to escape. Perhaps the 

 most distinctive feature is in the form of the conidia, which are elongated 

 fusiform, or unequal-sided (20-25 x 5-7 /;). 



Sacc. Syll x. 6817. 



CATTLEYA DISEASE. 



A species of Gloeosporium has occurred around Paris on leaves of 

 Cattleya. 



Journ. E.H.S. xxix. p. 764. 



ONCIDIUM ANTHRACNOSE. 

 Glceosporium Oncidii (Oud.). 



This species occurred on the leaves of Oncidium in the Botanical 

 Gardens at Amsterdam. In this case the pustules are round and brownish- 

 grey, perforated in the centre for the escape of the conidia, which are 

 oblong or pear-shaped (14-17 X 4J-6 /*) and are ejected in a rosy mass 

 at the orifice of the pustule. 

 Sacc. Syll. xi. 3658. 



ORCHID HEMILEIA. 

 Hemileia americana (Mass.). 



A rust has made its appearance on leaves of Oncidium, imported 

 from Guatemala into this country. It is kindred to the dreadful 



