32 American Boletes 



large, angular, uneven, shallow near the margin, edges thin, 

 some of them elongated into coarse teeth; spores globose or 

 broadly ellipsoid, 7.5-9 fi long; stipe thick, equal, 3-7 cm. long, 

 1.5-3 cm. thick, reticulate at the apex only, or for half the 

 distance downward, bearing near the base a very conspicuous, 

 white, membranous, sheathing, persistent annulus. 



Frequent in low ravines and sandy places in woods in Wis- 

 consin, Iowa, and Minnesota. 



4. Boletus Clintonianus Peck 



Pileus convex, gregarious, 5-12 cm. broad; surface golden- 

 yellow to chestnut, becoming darker with age, smooth, viscid, 

 glabrous, with separable cuticle; margin at first incurved, then 

 thin and spreading; context 5 mm. or more thick, soft, pale- 

 yellow or golden-yellow, becoming very slightly greenish when 

 wounded, taste mild; tubes 5-7 mm. long, nearly plane in mass, 

 adnate or subdecurrent, not depressed, pale-yellow to melleous, 

 slightly discolored within when wounded, mouths subcircular, 

 more or less compound, small, rather irregular, edges acute, 

 changing to reddish or purplish-brown when bruised; spores 

 oblong, brownish-ochraceous, 10-12 X 4-5 a; stipe subequal, 

 straw-yellow and slightly reticulate at the apex, reddish-chestnut 

 and even below, solid, straw-yellow within, becoming slightly 

 reddish when bruised, 5-12 cm. long, 1-2 cm. thick; annulus 

 cottony-white or yellowish, ample, persistent, often appearing 

 double. 



Occasional in shaded grassy places in Canada and the north- 

 eastern United States south to New Jersey and west to Wisconsin. 



5. Boletus Lakei Murrill 



Pileus convex, often becoming plane, gregarious or sub- 

 cespitose, rarely solitary, 8-12 cm. broad; surface fulvous with 

 latericeous tints, appearing testaceous, densely imbricate- 

 floccose-scaly, owing to the rupture of the cuticle; margin white, 

 sterile, entire, involute when young; context sulphur-yellow, 

 unchanging or turning slightly yellowish-green when cut, with 

 pleasant odor and mild flavor; tubes large, decurrent, elongate 

 near the stipe, flavous when young, dark-dirty-flavous with a 

 greenish tint when older, unchanging when bruised; spores 

 oblong-ellipsoid, smooth, yellowish-brown, 8.5-10.5 X 3.5 n; 

 stipe subequal, 7X2 cm., flavous at the apex, then testaceous, 

 then adorned with the ample, white, persistent, cottony annulus, 

 and below this similar to the pileus in color and surface markings. 



