Desnnption of the Figures, 



TIO. 



5G. Kosting-spore of same gernjiiiatiiig ; a, promycelium ; 

 />, young promycelium spores, X 460. (After 

 Tulasnc.) 



Plate IY. 



57. rUohoJus ci')/,<faUi7iUii, cluster of specimens ; a, a\ 



sporangia ; h, swollen apex of liypha ; c, c, drops of 

 water exuded by the swollen portion of hyphas, X 

 100. 



58. Spores of same, x 400. 



59. Soroq-)orium scabies, spore-cluster, x 500. 

 59a. Single spores of same, x 500. 



60,61. Endodromia i77/-.?a, highly x. (After Berkeley.) 



62. Chitocla'Hinn Jonesii, portion of a sporangiferous 



branch, x 250. (After Berkeley.) 



63. Sporangium, a, of same dehiscing and allowing the 



single spore, h, to escape, x 500. 



64. Bremia laducce, mature gonidinm^ X 400. (After 



De Bary.) 



65. Germinating gonidium of same^ X 200. (After De 



Bary.) 



66. Plasmopara nirea, mature gonidium, x 400. 



67. Gonidium of same showing the protoplasm breaking up 



to form zoogonidia, X 400. 



68. Gonidium of same showing the zoogonidia in the act 



of escaping, X 400. 



69. Fully formed zoogonidia of same, x 400. 



70. a, section through the epidermis of a leaf of ^gopodium 



podafjraria, showing a gonidium, h, of the same ger- 

 minating on the surface and sending its germ tube, 

 r, through a stoma into the tissue of the leaf, X 400. 

 (All after De Bary.) 

 70a. Mncor lateritiiis, erect sporangiferous hyphoe, X 80. 



71. Optical section of same, x 400. 



72. Protomyres pmrpureo-tingens, portion of a leaf of a 



seedling hollyhock showing the dark blotches caused 

 by the parasite, nat. size. 



73. Spores of same, x 400. 



74. SpineUfis fusiger, sporangiferous erect hypha, showing 



