LIST OF ILLUSTRATIONS 
FIG. 
62. Hymenial layer of Armillaria mellea ; 
63. Rhizomorphs of Armillaria mellea between bark aid 
wood of larch stem . : ‘ : facing page 
64. Small portion of Fig. 63 enlarged F 
65. Section of larch stem attacked by Armillaria mellea . 
66. Hollow larch stem rotted by Polyporus sulphureus 
67. Armillaria mellea. Radial longitudinal section of 
larch wood showing ‘ black line’ . page 
68. Pa » Transverse section of larch wood 
showing ‘ black line’ : 
69, 70. Living larch-trees with honey fungus growing from 
their roots 
. page 
” 
‘ ‘ facing page 
71. Diagram showing life-cycle of heteroeciousrust . : . page 
72. Melampsoridium betulinum 5 i . facing page 
73. Sporangiophore of Phytophthora omnivora and coni- 
diophore of Fusoma parasiticum . . page 
xi 
