. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 32 BULLETIN 510, U. S. DEPARTMENT OF AGRICULTURE. out, shiny above, rather thin and shelflike, which is found abun- dantly throughout the South on hardwood timbers; and P. gilvus Schw. (PI. VI, figs. 2 and 3), a firm, comparatively thin, rather rigid species, yellowish within and reddish brown without as it ages. In the northeastern United States one occasionally finds on oak or chestnut timbers the heavy, tough, corky fruit bodies of Daedalea quercina (L.) Pers. (PI. VI, fig. 1). Wh
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 32 BULLETIN 510, U. S. DEPARTMENT OF AGRICULTURE. out, shiny above, rather thin and shelflike, which is found abun- dantly throughout the South on hardwood timbers; and P. gilvus Schw. (PI. VI, figs. 2 and 3), a firm, comparatively thin, rather rigid species, yellowish within and reddish brown without as it ages. In the northeastern United States one occasionally finds on oak or chestnut timbers the heavy, tough, corky fruit bodies of Daedalea quercina (L.) Pers. (PI. VI, fig. 1). When the plant develops nor- mally it forms large and sinuous pores, but in lumberyards it more often appears as abortive clay-colored cushions (PL III, fig. 4). It is one of the few fungi which attack white oak and chestnut. Another destructive group of fungi is represented by the genus Lenzites. Among the brown species there are three principal ones to be feared: Lenzites sepiaria (Wulf.) Fr. (PL VI, figs. 5 and 6),X. berkeleyi Sacc. (PL VI, fig. 7), and L. trabea (Pers.) Fr. (PI. VII, fig. 1). The first two con- stitute the most seri- ous enemies of conif- erous structural tim- ber in the United States. The last spe- cies rots both the heartwood and sap- wood of many differ- ent kinds of hard- woods. All three are brown throughout and leathery to corky in texture. In some fruit bodies the under surface may consist of distinct gills; in others, the gills may more or less run together to form sinuous to subcircular pores, easily visible to the naked eye. Another species, Lenzites betulina (L.) Fr. (PL VII, figs. 2 and 3), of a general creamy color, with an upper surface frequently banded with shades of yellow, orange, and brown, occurs on hardwood tim- ber throughout the United States. It has commonly been noted in lumberyards on timbers used in various structures. In one large mill yard where oak was largely used for planking the elevated tram- ways, this species, in conjunctio
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