EXPLANATION OP PLATES. 24) 



Plate Hg, 



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

 minis). 



58. Cluster of spores ef oom-mildew, magnified {Bauer). 



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



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

 cinia coronatd). 



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

 sori. 



62. Spore of coronated mildew {Puccinia coronatd) x 

 highly. 



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

 spngenesiarum). 



64. Spores of Thistle-brand {Puccinia apngenesiarum) 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 menthce). 



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



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

 vmhelliferarum) . 



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

 X 320. 



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



74. Spore of Ground-ivy brand {Puccinia Olechomalis) 



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 puherulenta) . 



79. Spores of Willow-herb brand {Puccinia puherulenta) 



X 320. 



80. Leaf of Pennywort with brand {Puccinia umhilici). 



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. 



84. Grain of Wheat infected with EcBtid smut {Tilletia 



caries). 



85. Longitudinal section of the same. 



86. Spores of Eoetid smut {Tilletia caries) mixed with 



delicate branching threads x 320. 



