142 THE POLYPORACEAE OF WISCONSIN. 



Not very common. A few specimens were found near Hazelhurst 

 in August, 1904). The largest was 11 cm. in diameter, the stipe 8 

 cm. long and 1 cm. thick. When young and vigorously growing 

 the pileus is yellowish brown, but when dry and the glutinous pel- 

 licle has disappeared they are pale-yellow. The substance is softer 

 than! in most of the Boleti, and when dried the pileus becomes very 

 thin. 



Peck (21, 2, 8, p. 96) says that the plant is gregarious and occasion- 

 ally cespitose. He gives the measurements of the spores as 7.6 to 8.9 

 microns long and 4 microns broad. 



The brown gluten of the pileus and the granules on the pores and 

 stipe are the chief distinguishing marks of this species. 



Boletus brevipes Peck (Plate XIX, fig. 66). 



Pileus thick, convex, covered with a thick tough gluten when young 

 or moist, dark chestnut color, sometimes fading to dingy-tawny, the 

 margin inflexed, flesh white or tinged with yellow ; tubes short, nearly 

 plane, adnate or slightly depressed around the stem, small, subrotund, 

 at first whitish, becoming dingy-ochraceous ; stem whitish, not dotted, 

 or rarely with a few very minute inconspicuous dots at the apex, very 

 short ; spores subf usif orm, 7.5 microns long, 3 microns broad. 



Pileus 3.75 to 6.25 cm. broad ; stem 1.25 to 2.5 cm. long, 6 to 10mm. 

 thick. 



Common near Standing Rock, Kilbourn. September, 1910. 



Boletus hirtellus Peck (Plate XIX, fig. 63). 



Pileus broadly convex, soft, viscose, golden-yellow, adorned with 

 small tufts of hairs or fibrils, flesh pale-yellow; tubes adnate, medium 

 size, angular, becoming dingy-ochraceous; stem subcespitose, equal, 

 stout, glandular-dotted, yellow; spores pale ochraceous-brown, 8.75 

 to 10 microns long, 4 microns broad. 



Pileus 5 to 10 cm broad ; stem 5 to 7.5 cm. long, 8 to 12 mm. thick. 



A few specimens of rather doubtful identity were found near Stand- 

 ing Rock, Kilbourn, September, 1910. 



Boletus subaureus Peck (Plate XVIII, fig. 61). 



Pileus convex or nearly plane, viscose, pale-yellow, sometimes adorned 

 with darker spots, the young margin slightly grayish tomentose, flesh 

 pale-yellow; tubes small or medium, somewhat angular, adnate or sub- 



