334 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Vanilla Anthracnose. 



Gkeosporium vanilla (C. & M.). 

 Hainesia vanilla (Mass.), PI. XV. fig. 29. 



The Vim ilia disease described by G. Massee has evidently no con- 

 nection with Bidgood's Anthracnose, nor has it, perhaps, much interest 

 for the English cultivator, but concerns more intimately Vanilla-growing 

 countries. This species has been found to develop into a higher con- 

 dition systematically, where it is known as Calospora vanilla, but its 

 destructive stage is the Anthracnose. 



It appears on the leaves of Vanilla in the Mauritius, Seychelles, and 

 Reunion Islands, as well as New Granada. The pustules are small, on 

 either surface, covered by the blackened cuticle. The conidia are elongated, 

 elliptical, and colourless (14-16x6-7 //). 



On account of some slight technical distinction, of very doubtful value, 

 the name has recently been changed to Hainesia vanillce, but the name 

 is of very slight importance. 



Sacc. SylL x. 6815 ; Grevillea, xv. p. 18 ; Keio Bulletin, 1892, 

 No. 65, plate ; Mass. PL Dis. pp. 113, 368. 



Bidgood's Orchid Anthracnose. 



Gloeosporium Bidgoodii (Cooke), PI. XV. fig. 30. 



This disease has only been determined during the latter part of the 

 year (1901), although its effects have been recognised for the past six 

 years. The leaves attacked have been those of Odontoglosstim. The 

 tips of the leaves become yellow, but the spots appear to start anywhere, 

 and now the black shining pustules have been found upon the spots, 

 which Mr. Bidgood has correctly indicated as those of a species of 

 Glu'osporium, but as he has not described it hitherto it is but courtesy to 

 associate it with his name, as he devoted much time and energy to its 

 investigation. 



The pustules are rather large, and covered by the blackened cuticle, 

 at Length ruptured for the escape of the conidia. The stroma upon which 

 the conidia are produced is also blackened, but the conidiophores become 

 hyaline above, bearing the narrowly elliptic conidia (18- 20 x 4 //), which 

 have two nuclei. No direct evidence has yet been furnished that the 

 oonidia become uniseptate, although one of the microphotographs taken 

 might give that impression. 



Journ. II. U.S. kxvl 1901, pp. cxxxix and cxli, vol. xxviii. p. 262; 

 Trans, lint. Myc. Hoc. 1903, p. 15. 



American Orchid Anthracnose. 

 ( iln osporhim cinctum (B. & C), PI. XV. fig. 31. 



This species occurred on cultivated Orchids in Massachusetts, and 

 was described by Berkeley. The pustules are minute and gregarious, 

 < < \, red and circled by the blackened epidermis, so as to appear like little 

 black rings. The conidia are oblong and obtuse at both ends, sometimes 



