Fig. 140.— Oidium Euonymi-japonic/k (Arc.) Sacc. 



2, 3, oonidiophores bearing conidia, 1 and 2 from examples gathered in the 

 open, 3 from an example cultivated in the damp, still atmosphere of a 

 greenhouse. > 400. 4, seven ripe conidia. >: 400. 5, a conidium ger- 

 minating on the surface of a leaf of Euonymus japonicus, forty-eight hours 

 after being sown: a, appressorium ; h, haustorium. x 400. 6, two ap- 

 pressoria on the hyphae of the mycelium, x 070. 



