34 THE POLYPORACEAE OF WISCONSIN. 



cimens often become greenisli. This is due to an abundant growth 

 of an alga. 



The hymenium also varies in color from white through ashy-gray- 

 to tawny and almost rusty-brown. 



The tubes are short, very sinuous with toothed dissepiments which 

 soon become torn into teeth. 



In form the pilei may be resupinate, reflexed, sessile, imbricated or 

 laterally confluent. Old specimens become black, hard and less hir- 

 sute. 



The distinguishing characteristics are the leathery, velvety-hirfeute, 

 sulcate pileus, and the whitish to grayish shallow sinuous pores which 

 become cut into teeth. 



Syn. : Boletus unicolor BuUiard; 7, vol. I. p. 365-501, fig. 8. 



Cerena unicolor (Bull.) Murrill, 15, vol. 32, p. 97. 



Daedalea confragosa. (Bolt.) Persoon (Plate III, fig. 12). 



Pileus sessile, somewhat imbricated, slightly convex, of corky- 

 leathery, almost woody consistence, rough, reddish-brown with indis- 

 tinct concolorous zones, wood colored within, becoming brown; pores 

 narrow, labyrinthine, torn, at first gray-pruinbse, later reddish-brown. 



The pilei are either plane pale above or slightly convex, and always 

 convex beneath. The surface is usually rough-scabrous, or concentric- 

 ally corrugated. The color varies from gray to reddish brown. The 

 margin is acute, and even. 



The pores are at first trametoid, white, then they become darker and 

 more sinuous, finally in old specimens they break down into thin fus- 

 cous lamellae. If horizontal sections be cut through even the most 

 lenzitoid specimens, the top of the h3Tnenium will still be seen to be 

 daedalioid, showing that this breaking down into lamellae is only su- 

 perficial. A series of pores, from the trametoid type to the lenzitoid 

 form is shown in figures 12 b to g. The top of the pileus is shown in 

 figure a. 



Sometimes the surface of the pileus becomes roughened toward the 

 base, while toward the margin it is marked by narrow regular con- 

 centric sulcations which in turn are crossed by slight radial rugae. 

 In a few specimens the margin is wavy and lobed. 



Peck (22, 30 p. 71) says that D. confragosa, Trametes ruhescens, 

 Lenzites Cookei, L. crataegi, L. proxima and possibly L. Klotzschii are 

 orie species. Prof. Macbride also includes Lenzites corrugata and L. 

 hicolor with Daedalea confragosa. 



