124 THE POLYPORACEAE OF WISCONSIN. 



The largest measures about 12 cm. in width ; the stem 6 to 10 cm. in 

 length and 2.5 cm. thick. 



Localities: Milwaukee, Madison, Horicon, Blue Mounds, Sparta, 

 Crandon and Hazelhurst, A few specimens were found growing on de- 

 cayed wood at Crandon. These were small and had a very bitter taste. 



The variety obesus occurs also but is rarer. It is much larger than 

 the ordinary species. The stem is sometimes over 3 cm. thick and is 

 reticulated nearly or quite to the base. 



Boletus indecisus Peck (Plate XXVI, fig. 82.) 



Pileus convex or nearly plane, dry, slightly tomentose, ochraceous- 

 brown, often wavy or irregular on the margin, flesh white, unchange- 

 able ; taste mild ; tubes nearly plane or convex, adnate, grayish, becom- 

 ing tinged with flesh-color when mature, changing to brownish where 

 wounded, their mouths small, subrotund; stem minutely furfuraceous, 

 straight or flexuous, reticulated above, pallid without and within; 

 spores oblong brownish flesh-color, 12.5 to 15 microns long, 4 microns 

 broad. 



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



This fungus bears some resemblance to B. felleus but Professor Peck 

 says that the mild taste and darker colored spores will separate it from 

 that species, while the stem which is slightly reticulated above distin- 

 guishes it from B. alutarius. 



Localities: Blue Mounds, Wauwatosa. The cap is about 9 cm. in 

 diameter. The stipe 12 cm. long and 1 cm. thick ; it is only very slightly 

 reticulated above. 



Boletus gracilis Peck. 



Pileus convex, glabrous or minutely tomentose, rarely squamulose, 

 ochraceous-brown, tawny-brown or reddish-brown, flesh white; tubes 

 plane or convex, depressed around the stem, nearly free, whitish, be- 

 coming pale flesh-colored, their mouths subrotund ; stem long, slender, 

 equal or slightly tapering upward, pruinose or minutely furfuraceous, 

 even or marked by slender elevated anastomosing lines which form long 

 narrow reticulations ; spores subf erruginous, 12.5 to 17 microns long, 5 

 to 6 microns broad. 



Pileus 2.5 to 5 cm. broad; stem 8 to 12 cm. long, 4 to 8 mm. thick. 

 Woods. 



"The slender habit," says Peck, "separates this species from all the 

 others here included in this tribe [HyporJiodii]. Its spores are not a 



