xxiv.] BARBERRY BLIGHT. 167 



upon other barberries than the wild barberry of Britain 

 has long been well known. A short paper from the pen 

 of Mr. Charles B. Plowright, M.R.C.S., has been published 

 in the Proceedings of the Royal Society, No. 228, 1883. 

 In this paper Mr. Plowright considers he has proved by 

 experiment that the jflridium upon Mahonia is one con- 

 dition of the summer mildew of corn, Puccinia graminis, 

 Pers. Mr. Plowright kindly furnished us with numerous 

 examples of Mahonia berries on which the ^Ecidium was 

 growing, not only upon the exterior of the berries, but 

 sometimes upon the seeds exposed in berries burst by the 



FIG. 87. 



Berries of Mahonia Aquifolium, Lindl., invaded by dZcidium Berberidis, 

 Pers. Enlarged 5 diameters. 



growth of the fungus. Doubtlessly the JEcidium cups grew 

 on the seeds after the berries were burst. Two MaJwnia 

 berries badly infested with the dScidium are illustrated at 

 Fig. 87, enlarged five diameters. The presence of the 

 fungus, as is usual, causes hypertrophied or greatly swollen 

 places on the affected part. We shall refer to Mr. Plow- 

 right's communication further on ; in the meantime we 

 point out that the parasite sometimes occurs on the leaves 

 and petioles, as well as the berries of Mahonias and the 

 other ornamental species of garden barberries. 



