EXPLANATION OP PLATES. 24 > 



Plate fig. * 



rV. 67. Wheat-straw attacked by mildew (Puccinia gra-' 

 minis). 



58. Cluster of spores of corn-mOdew, magnified (Bauer). 



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



60. Portion of blade of grass with coronated mildew {Puc- 

 cinia coronata). 



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 



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

 mones). 



66. Spore of Anemone-brand {Pucchiia 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 menthce). 



70. Spore of Mint-brand {Puccinia menthce) x 350. 



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

 umbelliferarum) . 



72. Spore of Earth-uut 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 pukeridenta) . 



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. 

 Portion of leaf of Dandelion with its brand. 

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

 Grain of Wheat infected with Foetid smut (Tilletia 



caries). 

 Longitudinal section of the same. 

 Spores of Foetid smut (Tilletia caries) mixed with 



delicate branching threads x 320. 



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