American Wood-Preservers'" Association 9 



smoothed with sandpaper and also photographed, and this section was 

 then sawed through with the grain beneath the sporophores to show 

 the longitudinal configuration of the infected or decayed area. About 

 125 photographs were thus made. 



Very few fungi were found on white oaks, these being limited 

 to four common species, mainly confined to the sapwood. At least 

 nine species were found on red oaks, but here the difference in 

 resistance between the heart and sapwood is not particularly marked, 

 although the sap is often attacked first. Of the other hardwoods, red or 

 sweet gum which was low grade heart or high in sapwood harbored at 

 least four species of wood destroyers and was especially susceptible to 

 stains. Beech was particularly attacked by the "button fungi" (Hypoxy- 

 lon) and the "jelly fungus" (Exidia glandulosa) . Pines were mainly 

 infected with three fungi, only one of which, the brown fungus, Lenzites 

 sepiaria, causes serious decay. 



For the benefit of the inspector the fungi here reported may be 

 thrown into three classes, of which only the first group need give 

 serious concern. 



Group I — Fungi Which Attack Wood Severely 

 Conifers (Pines, Hemlock, Tamarack, Etc.) 

 Fomes roseus. Lenzites sepiaria. 



Lentinus lepideus. Polystictus abietinus. 



Hardwoods 



Daedalea confragosa. Lenzites trabea. 



Daldinia concentrica. Panus stipticus. 



Exidia glandulosa. Pholiota adiposa. 



Gloeoporus conchoides. Polystictus pargamenus. 



Hydnum erinaceum. Polystictus versicolor. 



Hypoxylon cohaerens. Stereum fasciatum. 



Hypoxylon coccineum. Stereum rameale. 



Lenzites betulina. Trametes sepium. 



Group II — Fungi Which Attack Wood Slowly and Need Not 

 Ordinarily be Discriminated Against 

 Hardwoods 

 Hypocrea citrina. Schizophyllum commune. 



Group III — Fungi Which Need Not Be Discriminated Against 

 9 Conifers 



Blue-stain (Ceratostomella spp.). Schizophyllum commune. 

 Peniophora gigantea. 



Hardwoods 



Blue-stain (Ceratostomella spp.). 

 Olive-black mold (Lasiosphaeria pezizula). 



In order to identify these fungi the following key, based on the 

 principal and more conspicuous characters, will be found useful. Fol- 

 lowing this the fungi are briefly described and information given as 

 to their prevalence, distribution and species of timber attacked. 



