The Diagnosis of Decay in Wood PLATE 9 
Large test tubes (5X40 cm.) containing test sticks inoculated with wood-destroying fungi. 
A. —Pure culture of P. sulphureus isolated from oak and inoculated oh a stick of Psevdotsuga taxifolta 
heartwood with malt agar at the base. 9/16 natural size. 
B. —Pure culture of P. anceps isolated from Picea canadensis and inoculated on a stick of Ptcea sxtcnensis 
heartwood moistened with distilled water. 9/16 natural size. 
C and D.—Sapwood and heartwood sticks of Populus tremuloides inoculated with a pure culture of the 
fungus ( PolyporiLS adustusf) isolated from the orange-zone white rot areas in sap gum lumber. Note 
the more luxuriant growth in the sapwood stick 4c G”-and the formation of characteristic orange zone 
lines in the mycelium. 8/9 natural size. 
