Minnesota Plant Diseases. xv 



FIG. 38. Two ways in which wood is destroyed by wood-rot fungi. 



Highly magnified. After Hartig 86 



FIG. 39. A good example of an epidemic. Potato-blight has within 

 a week entirely destroyed the potato plants in this field. 



After Clinton 99 



FIG. 40. An epidemic of mildew on cucumbers checked by spraying. 



After F. C. Stewart 101 



Fie. 41. A lowly algal fungus. Highly magnified. After Schroeter. . 105 

 FIG. 42. Water and fish molds. Highly magnified. After various 



authors 106 



FIG. 43. Sewer-pipe fungi. Highly magnified. After Pringsheim. ... 108 

 FIG. 44. Downy mildews. Highly magnified. After De Bary. ... 109 



FIG. 45. A downy mildew with the aspect of a white rust. Original. . in 

 FIG. 46. A black mold. Highly magnified. After Zopf. . 113 



FlG. 47. An insect mold. Highly magnified. After Brcfeld 115 



FIG. 48. Yeast fungus cells. Highly magnified. After Rees. . 118 

 Fie. 49. Plum-pocket fungus and loose-weft fungus. Highly magni- 

 fied. Alter De Bary and Sachs I.M 



FIG. 50. A powdery mildew on common plantain leaf. Original.. i-'-j 



FIG. 51. The fruiting body of the powdery mildew of black haw. show- 

 ing the appendage-. Highly magnified. Microphoto- 



graph by K. \V. I). Hoi way i .s 



FIG. 52. The fruiting body of the powdery mildew of willows, show- 

 ing the appendages and spore-sacs. Highly magnified. 



Micropholograph by K \V. D Holway ij6 



FIG. 5.v Krgots of grasses. Original U7 



FlC. 54. Krgot fungus on canary grass. Original.. u8 



FIG. 55. Fruiting bodies and -porr- of thr t-rgot fungus. Variously 



magnified. After I uhi-m- and Breield 130 



FIG. 56. A caterpillar fungus. ( )riginal 131 



FIG. 57. A strangling funuus .m ^r;ss U-UM-S ainl ~u-inv ()riginal.. . I U' 



