, CHAPTER XXXIII. 



PEA MILDEW. 



Erysiphe Martii, Lk. 



THE description given of Erysiphe graminis, B.C., the 

 blight or mildew of grass, applies generally to Erysiphe 

 Martii, Lk., of peas, beans, Umbelliferae, etc. The species 

 is named in honour of Martins, the famous botanist, and 

 is the same with E. Pisi, Grev. 



The general appearance of the fungus, as seen upon a 



r 



FIG. 123. PEA MILDEW. 



Conceptacle of Erysiphe Martii, Lk., on leaf of pea. 

 Enlarged 100 diameters. 



leaf of the pea under the microscope, is shown, enlarged 

 100 diameters, in Fig. 123. The dark body in the 

 centre of the illustration is the conceptacle of the fungus, 

 with its jointed tentacle-like appendages. The involved 

 pattern in outline shows the epidermis of the leaf with its 



