EXPLANATION OF PLATES. 24 > 



Plate fig. 



IV. 57. Wheat-straw attacked by mildew (Puccinia gra- 

 minis) . 



„ 58. Cluster of spores of corn-mildew, magnified {Batter). 



„ 59. Single spore of corn-mildew {Puccinia graminis) x 300. 



„ 60. Portion of blade of grass with coronated mildew (Puc- 

 cinia corona to). 



„ 61. Portion of same enlarged, showing the pustules> or 

 sori. 



62. Spore of coronated mildew (Puccinia coronata) x 

 highly. 



63. Portion of leaf of Spear-thistle with its brand (Puccinia 

 syngenesiarum) . 



64. Spores of Thistle-brand (Puccinia syngenesiarum) x 

 320. 



65. Leaf of Wood-anemone with brand (Puccinia ane- 

 mones). 



66. Spore of Anemone-brand (Puccinia anemones) x 320. 



67. Leaf of Centaurea nigra with brand. 



68. Spores of Composite-brand (Puccinia compositarum) 

 x 320. 



69. Leaf of Mint with Mint-brand (Puccinia menthm). 



70. Spore of Mint-brand (Puccinia mentlue) x 350. 



71. Portion of leaf of Earth-nut with brand (Puccinia 

 umbelliferarum) . 



72. Spore of Earth-nut brand (Puccinia umbelliferarum) 

 x 320. 



73. Leaf of Ground-ivy with its brand (Puccinia Glecho- 

 matis). 



74. Spore of Ground-ivy brand (Puccinia Glechomatis) 

 x 320. 



75. Pustule of brand surrounded by the ruptured epidermis, 

 magnified. 



76. Portion of leaf and stem of Goatsbeard with brand. 



77. Spores of the same x 320. 



78. Portion of leaf of Willow-herb with its brand (Puc- 

 cinia pulverulenta) . 



79. Spores of Willow-herb brand (Puccinia pulverulenta) 

 x 320. 



80. Leaf of Pennywort with brand (Puccinia umbilici). 



81. Spores of Pennywort-brand (Puccinia umbilici) x 320. 



82. Portion of leaf of Dandelion with its brand. 



83. Spores of Variable-brand (Puccinia variabilis) x 320. 

 V. 84. Grain of Wheat infected with Foetid smut (Tilletia 



caries). 



85. Longitudinal section of the same. 



86. Spores of Ecetid smut (Tilletia caries) mixed witb 



n 



» 



»» 





» 



>» 

 n 

 if 



» 

 » 



» 



» 

 » 



>5 





delicate branching threads x 320. 



