Bui. 1298, U. S. Dept. of Agriculture 
Plate I 
Fig. 1. — Encrusting fruit bodies of Polystictus dbietinus on a hemlock pulp log. This fungus is 
very abundant on coniferous wood. The pore surface is violet when fresh 
Fig. 2. — Longitudinal section of log shown in fig. 1. Note the minute pockets, primarily in the 
sapwood, which are characteristic marks of this fungus 
Fig. 3.— Fruit bodies of Polyporus adustus on aspen pulp wood. The pore surface is smoky 
brown to smoky black. This fungus attacks hardwood pulp logs, particularly aspen, very 
vigorously. 
Fig. 4. — Rot in log shown in fig. 3 
Fig. 5. — Fruit bodies of Stereum sanguinolentum on spruce pulp log. At the ends of the log 
the fungus also forms small brackets. The spore-bearing surface "bleeds" if scratched when 
fresh. The fungus attacks mainly the sapwood of conifers and is not a severe wood destroyer 
Fig. 6. — Fruit bodies of Stereum purpureum on aspen pulp logs. The spore-bearing surface is 
purplish when fresh. This fungus is particularly prevalent on aspen and apparently produces 
considerable decay. The wood shown had been in the yard less than a year 
