LIST OF ILLUSTRATIONS xi 



FIG. 



62. Hymenial laj'er of A r miliaria mellea .... page 150 



63. Rhizomorphs of Armillaria mellea between bark and 



wood of larch stem facing page 150 



64. Small portion of Fig. 63 enlarged . . . . „ „ 150 



65. Section of larch stem attacked by Armillaria mellea . ,, „ 155 



66. 'KoWo-w \ATchs,tevLi rotted hy Poly porus sulphur em . „ ,. 155 



67. Armillaria mellea. Radial longitudinal section of 



larchwood showing 'black line' . page 155 



68. ,, „ Transverse section of larch wood 



showing ■ black line ' . . • „ 157 



69. 70. Living larch-trees \«th honey fmigus groAvuig from 



their roots ...... . facing page 166 



71. Diagram showing life-cycle of heteroecious rust . , . page 174 



72. Melampsoridiumhetulinum .... . facing page 175 



73. Sporangiophore of Phytophthora omnivora and coni- 



diophore of Fusoma parasiticum ..... page 180 



