APR 12 1920 



MYCOLOGIA 



Vol. XII March, 1920 No. 2 



ILLUSTRATIONS OF FUNGI— XXXII 



William A. Murrill 



The species here illustrated are conspicuous and easily recog- 

 nized by a number of good characters. Unfortunately, only one 

 of them, Boletus luteus, occurs in sufficient quantity to be relied 

 upon for food, but it is often very abundant and is one of the 

 best edible species we have. 



Boletus luteus L. 



Egg-yellow Boletus 



Plate 2. Figure 1. X 1 



Pileus convex, solitary, 5-10 cm. broad ; surface smooth, 

 glabrous, very viscid, yellowish-brown, grayish-brown, or reddish- 

 brown, sometimes streaked, becoming darker and duller with age ; 

 context compact, pale-yellowish, darker with age, unchanging 

 when wounded, edible; tubes 1.5-^2.5 mm. long, plane or convex 

 in mass, adnate or slightly decurrent, somewhat depressed, dark- 

 melleous, unchanging when wounded, darker with age, mouths I 

 mm. in diameter, nearly circular, the edges adorned with reddish- 

 brown dots ; spores oblong-fusiform, smooth, yellowish-brown, 

 6-9 X 2. 5-4 /a; stipe slightly tapering downward, pale-yellow to 

 reddish-brown, glandular-dotted both above and below the an- 

 nulus, solid, yellowish and unchanging within, about 3-6 cm. 

 long, 1-2 cm. thick ; annulus large, membranous, white to slightly 

 brownish, glandular-dotted, persistent. 



This large and striking edible species occurs in sandy soil in 

 coniferous or mixed woods throughout Europe and the eastern 

 United States, being more abundant in cooler regions. It ex- 

 hibits several variations and has received several names, but is 



[Mycologia for January (12: 1-58) was issued February 2, 1920] 



59 



