LIST OF ILLUSTRATIONS. 



FIG. PAGE 



50. Clover and Dodder seeds germinating, x 2 . . 119 



51. Germinating Dodder seed, fixing on seed leaves of 



clover, x 10 120 



52. Infant Dodder plant on young clover leaf, x 10 . 120 



53. Fragment of clover stem, with Dodder entwined, 



showing connection of latter by suckers, x 15 . 122 



54. Anatomical connection of clover Dodder with clover 



stem, x50 124 



GRASS MILDEW. 



55. "Wheat stem invaded by Erysiphe graminis, D.C., x2 127 



56. Oidium monilioides, Lk. The early condition of 



Erysiphe graminis, D.C., x 400. Germinating 

 conidium, x 1000 127 



57. Conceptacle of Erysiphe graminis, D.C., x 100 . 129 



58. Horizontal section through conceptacle of Erysiphe 



graminis, D.C., x 200 130 



59. Vertical section through conceptacle of Erysiphe 



graminis, D.C., x 100 131 



60. Asci and sporidia of Erysiphe graminis, D.C., x 500. 



Germinating sporidium, x 1000 .... 132 



61. Conceptacle of Erysiphe graminis, D.C., bursting in 



spring, xlOO 133 



CORN MILDEW SPRING RUST AND MILDEW. 



62. Fragment of wheat leaf invaded by Uredo Rubigo- 



vera, D.C., x 3 136 



63. Pustules or soil of Uredo Rubigo-vera, D.C., x 25 . 137 



64. Section through a sorus of Uredo Rubigo-vera, D.C., 



x200 137 



65. Germinating spore of Uredo Rubigo-vera, D.C., 



xlOOO 133 



66. Fragment of wheat stem invaded by Puccinia 



Rubigo-vera, D.C., x 5 139 



67. Soil of Puccinia Rubiyo-vera, D.C., x 25 . . 139 



68. Section through sorus of Puccinia Rubigo-vera, D.C., 



x200 140 



69. Teleutospore of Puccinia Rubigo-vera, D.C., ger- 



minating in spring, x 1000 . . . . .141 



