Figure 291.—Boletus sullivantii.
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, 10–20µ 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.
Boletus parvus. Pk.
Parvus means small; so named from the smallness of the plant.