PESTS OF THE VINERY AND STOVE. 



335 



curved, granular within (10-15 x 2^-3 yu). The species of Orchid has not 

 been recorded. 



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 Glwosporium Bidgoodii, since the 

 external appearance and fruiting appear to be different. 



Sacc. Sytt. m. 3765 ; Joum. B.H.S. xxvi. 1902, p. 729, fig. 305. 



Other Orchid Anthracnose. 



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

 the known species of Anthracnose found on Orchids. 



Malagassy Orchid Anthracnose. 

 Glo&osporium 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 /x). 



Sacc. Syll. x. 6816. 



Mexican Orchid Anthracnose. 

 Glo&osporium, 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. 



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. 



Screw-pine Black Anthracnose. 

 Melanconium pandani (Lev.). 



Screw Pines under cultivation are liable to attack from a fungus 

 which settles itself irrespectively upon the trunk, aerial roots, and adven- 

 titious branches, where it forms small black pustules, which are sometimes 

 so numerous as to blacken the parts attacked. The productive cells are 



