STEREUM 



397 



carefully studied the effect produced by the fungus, and shows 

 that it is very characteristic and distinct from that produced by 

 any other fungus. When the wood is first attacked it changes 

 to a clear brown colour, variegated with numerous white 

 patches, somewhat resembling the plumage of the breast of a 

 partridge. At a later stage the white patches become holes in 

 the wood, lined by the white mycelium of the fungus. The 





FIG. 124. Stereum frustulosum. i, group of fungi on a 

 piece of oak wood ; 2, section through fungus, showing 

 stratification ; 3, basidia with spores, and two paraphyses. 

 Fig. i slightly reduced ; 2, slightly mag. ; 3, highly mag. 



remaining portions of wood become darker in colour, and 

 very hard. At a later stage the diseased wood presents the 

 appearance of having been riddled by insects. 



Tuberculose, woody, crowded, looking like one much 

 cracked specimen, under surface and glabrous margin brown- 

 ish-black, substance distinctly stratified ; hymenium convex, 

 cinnamon, then pale, primrose ; spores elliptical, ends sub- 

 acute, 4'5X3-3'5 ./* 



Diseased patches should be cut out until sound wood is 

 reached, and the wound at once coated with gas-tar. As 



