DISPOSAL OF INFECTED SLASH 39 



seems to indicate that it does not grow after the death of the tree." 

 In another work, discussing the fungous diseases of forest trees, the 

 same author -^ makes the general statement that "In the majority of 

 cases the fruiting bodies do not form on the trunk after the fall of 

 the tree." Trametes pint is given as an example, and this statement 

 apparently contradicts the preceding reference. In a study of the 

 diseases of the hardy catalpa, von Schrenk ^^ states that Polystictus 

 versicolor will not attack or continue its growth upon this host after 

 the tree is cut. Stevens ^^ has demonstrated that the reverse is true, 

 and finds that the wood of this host is quite generally attacked by other 

 saprophytes as well. Pomes pinicola (Polyporus ponderosa) was 

 found by von Schrenk "'' to develop readily on fallen trees of Pinus 

 ponderosa, forming as many as 20 or 30 on a log 10 feet in length 

 favorably placed in regard to available moisture. Polyporus fraxin- 

 ophilus is found by von Schrenk -^ to develop only on its living host 

 and not upon fallen trees. In 1907,^^ discussing Polyporus lucidus, he 

 states that "the fruiting organ of this fungus in one case developed in 

 about two months from the time the trees were cut down," and later, 

 in 1908,'* he says of Polyporus rimosus that the sporophores develop 

 only upon living trees. 



Von Schrenk and Spaulding in 1909,-'^ in a study of the diseases 

 of deciduous forest trees, find that ArmiUaria mcllea, Fomes igniarius, 

 Polystictus versicolor, Polyporus sulphureus, Fomes applanatiis, and 

 Fomes fomentarius continue alive and produce sporophores for a con- 

 siderable time on down and dead timber, and that in the case of 

 Fomes rimosus sporophores are not produced on fallen infected wood. 

 Weir has found sporophores of F. rimosus in Indiana developing on 

 down trees. Many other fungi are mentioned as developing fruiting 

 bodies on down timber, but the majority of them are primarily sapro- 

 phytic and rarely attack the living hosts. Faull ^ states that Fomes 

 officinalis (F. laricis), a harmful, timber-destroying fungus, is often 

 found fruiting on the down portions of its hosts. 



BuUer,^ writing on Polyporus squamosum, states that when a tree 

 has been killed by this fungus it still continues its annual production 

 of sporophores, and Freeman,^ writing of the same fungus, states that 

 it is usually found on dead logs and stumps. More recently Abbott ^ 

 in 1915, working with Trametes pini, found "that the growth of the 

 mycelium in fallen trees is dependent almost entirely upon moisture 

 conditions," and demonstrates this by experiments with infected wood, 

 but believes "that trees which fall in the woods as a result of per- 

 meation by the fungus do not fall ordinarily under such conditions as 



