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. (PL VI, figs. 2 and 3), a jBrm, 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. (PL VI, fig. 1).' When the plant develops nor- 

 malh' it forms large and sinuous pores, but in lumberj^arcls 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),Z. herkeleyi Sacc. 

 (PL VI, fig. 7), and 

 L. trahea (Pers.) Fr. 

 (PL 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 

 "^f b r o Av n throughout 



Fig. 33. — A very congested retail yard at New Orleans, La., . . 



showing lumber temporarily placed on the ground in solid and leatliery tO 



piles. This is a bad practice, because under such condi- corkv in texture. In 

 tions decay may start in a very short time. ' „ . , , , . ^ , 



some iruit 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 hetulina (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 

 lumljeryards on timbers used in various structures. In one large 

 mil] yard where oak was largely used for planking the elevated tram- 

 ways, this species, in conjunction with Polystictus vei'sicolor, sue- 



