x LIST OF ILLUSTRATIONS 
29. Single fructification of Fomes annosus. Upper surface facing page 
30. 33 Led 
31. Fomes annosus. Annular rot with a central unrotted 
a 93 Lower surface ,, 33 
core ‘ ‘ 9 * 
32. Fomes annosus. Figured rot : ‘ - ae - 
33. Black specksin wood of larch caused by Fomesannosus  . page 
34, Transverse section of black speck in wood of larch. 2 35 
35. Longitudinal section near edge of black speck . ‘ aa 
36. Fomes annosus. Figured arrangement of rot . . facing page 
Sle Sy os Base of larch trunk excavated 
underneath ‘ i ‘  8y Ss 
38. oy, 3 Fructification showing pores in 
longitudinal section . : Tr as 
39. iy, 5 Under surface of fructification 
showing mouths of pores . o 5 
40. Upper surface of fructification showing concentric 
furrows and white margin . 3) 5 
41. Fomesannosus  . : : ‘ . page 
42, Diagram showing necessity for pores to be vertical - 
43. Fomes annosus. Conidiophore and conidia . : bh: Sys 
44, 45. Cultures of Fomes annosus : ‘ é . facing page 
46. Polyporus Schweinitzii. Stipitate fructification - 3 
47. Pr $5 Bracket-shaped fructification ,, 55 
48. Hymenial layer of Polyporus Schweinitzit a . . page 
49, 50. Sections of larch-tree showing rot caused by 
Polyporus Schweinitzii # . . facing page 
51. Piece of larch wood rotted by Polyporus Schweinitzii 
52. Section of Scots pine stem with rot caused by Poly- 
porus Schweinitzit 5 . ‘ : F 
53. Mycelium of Polyporus Schweinitzii in wood of larch . page 
54, Section of larch wood after attack by Polyporus Schweinitzii 
55. Poria vaporaria 
” + 
” 
2? 
56, 57. Sections of larch wood netied ‘ Reine Pini . facing page 
58, 59. Armillaria mellea. Group of toadstools growing 
from base of deodar . 
60, 61. 55 »  Toadstools growing from rhi- 
zomorphs in soil : rr ” 
