360 MUSHROOMS, EDIBLE AND OTHERWISE 



The pileus in the young plant is much more highly colored and fades out 

 in age, but the margin does not become paler than the disk as is often the case 

 with B. edulis. The specimens in Figure 290 were found in Michigan and 

 photographed by Dr. Fischer. They are quite as good as B. edulis. 



Figure 290. Boletus edulis, var. clavipes. Two-thirds natural size. Note confluent caps on right. 



Boletus Sullivantii. B. & M. 



Sullivantii is named in honor of Professor Sullivant, an early Ohio 

 botanist. 



The pileus is three to four inches broad, hemispherical at first, glabrous, 

 reddish-tawny or brown, brownish when dry, cracked in squares. 



The tubes are free, convex, medium size, angular, longer toward the margin, 

 their mouths reddish. 



The stem is solid, violaceous at the thickened base, red-reticulated at the 

 apex, expanded into the pileus. 



The spores are pallid to ochraceous, oblong-fusiform, 10-20/x long. Peck's 

 Boleti in U. S. 



This species is very close to Boletus scaber and Boletus edulis. It differs 

 from B. scaber in its reticulated stem and from B. edulis in its larger tubes. The 

 specimens in Figure 291 were found by Hambleton Young near Columbus, and 

 were photographed by Dr. Kellerman. 



