American Boletes 27 



yellow, fleshy, considered poisonous in some species; tubes small, 

 yellowish within, mouths red or orange from the first, not covered 

 with a veil; spores oblong-ellipsoid, smooth, yellowish-brown, 

 sometimes with greenish tints; stipe solid, usually reticulate or 

 dotted. 



1. SuiLLELLUS LURIDUS (Schaeff.) Murrill 



Pileus convex, gregarious or subcespitose, 5-12 cm. broad; 

 surface dry, smooth, glabrous or minutely tomentose, sometimes 

 clothed with rather conspicuous appressed, felted fibers, occa- 

 sionally rimose-areolate, brown with shades of red or yellow, 

 often bright-brownish-red, becoming paler with age; margin 

 thick, obtuse, entire, sometimes slightly differing in color; con- 

 text firm, whitish to flavous, quickly changing to blue when 

 wounded, sometimes unchanging in older plants, somewhat 

 poisonous; tubes nearly free, rarely adnate, plane or slightly 

 convex in mass, yellow within, changing to dark-greenish-blue 

 when wounded, mouths small, circular, cinnabar-red, becoming 

 brownish-orange, darker with age; spores oblong-ellipsoid, 

 smooth, olivaceous when fresh, 11-16 X 4-6 fi; stipe subequal, 

 5-10 cm. long, 1-2 cm. thick, usually furfuraceous or punctate, 

 at times nearly glabrous, rarely reticulate at the apex or on the 

 upper half, red or reddish-brown below, yellow or orange above, 

 the dots rosy or dark-red, solid, yellow within, varied with red 

 or purple. 



Extremely common in open woods and on shaded banks 

 throughout temperate North America. Somewhat poisonous. 



2. SuiLLELLUS Frostii (Russell) Murrill 



Pileus convex to plane, gregarious, 6-15 cm. broad; surface 

 glabrous, shining, viscid in damp weather or when young, 

 blood-red, sometimes paler-red with patches of yellow; context 

 firm, juicy, white or yellowish, scarcely changing to greenish- 

 blue when wounded, taste mild; tubes adnate, subdecurrent, 

 depressed, straw-yellow within, changing slowly to greenish-blue 

 when injured, yellowish-brown with age, mouths large, stuffed, 



