64 THE POLYPORACEAE OF WISCONSIN. 



near Hazelhurst on a shrub ; the first on poplar, the others on oak. 

 The largest specimen is about 4 cm. wide, 3 cm. long, and 3 mm. thick, 

 but the base is much thicker. The pilei are usually imbricated or later- 

 ally confluent ; the base is thick and somewhat decurrent. Young spec- 

 imens are a pale yellow, while older ones may be grayish or ochraceous. 

 The margin is acute, even, usually incurved on drying and a little 

 lighter than the pileus. The whole pileus is covered with very soft 

 pubescence and has usually from 1 3 slight concentric sulcations. 

 The pores are medium, from white to tawny, or in some instances they 

 become slaty ; usually irregular, about twice as long as the thickness of 

 the white floccoso-fibrous substance of the pileus. Dissepiments not as 

 obtuse as in P. Tiirsutus. 



Closely related to P. versicolor, P. hirsutus, P. velutinus and P. bal- 

 sameus. The shining zones distinguish the first; it is thinner than 

 P. hirsutus and has larger, less obtuse pores; P. velutinus is thinner, 

 with a more acute margin, and smaller, more rounded pores. The last 

 species has also slighter villosity which is distributed in patches or zones. 



Polystictus velutinus Fries (Plate IV, fig. 21). 



Pileus corky-coriaceous, plane on both sides, soft-velvety, indis- 

 tinctly zoned, white becoming yellowish, margin plane, acute; pores 

 round, minute, dissepiments thin, white. 



" About 5 cm. broad, moist when young, then hard, not shining like 

 P. versicolor, zones sometimes a little obscured. ' ' ( Sac.) 



This species is not very common. Specimens found on Madaline 

 Island and at Star Lake on birch logs. Largest specimen 4cm. 

 broad, 3.5cm. long, 7mm. thick; tubes 4mm. deep. The specimens 

 belong to the var. glalriusculus Bres. They are glabrate or nearly 

 so, rough-tuberculate near the base which is narrowed so as to make 

 the pilei substipitate or flabelliform. The substance is white, the sur- 

 face yellowish, subzonate; the margin plane, acute. The pores are 

 small, whitish with thin dissepiments. 



The species is distinguished from its allies P. hirsutus, P. versicolor 

 and P. zonatus by being more delicate, lighter in color and weight, and 

 less zonate. 



Polystictus hirsutus (Schrad.) Fries. 



Pileus suberose-coriaceous, convexo-plane, rough with rigid hairs of 

 one color, whitish, but zonate with concentric furrows; pores round, 

 obtuse, whitish or sub-fuscous. 



