Although apparently distinct, this and the two preceding species are not sufficiently well known. Peck, Boleti of the U.S.
B. tabaci´nus Und. Pileus fleshy, convex or nearly plane, subglabrous, often cracked in areas, tawny-brown. Flesh at maturity soft and similarly colored. Tubes concave or nearly plane, depressed around the stem, their mouths small, angular, colored like the pileus. Stem subequal, solid, reticulated, concolorous. Spores oblong or subfusiform, 12.5–14×5µ. Pileus 2.5–5 in. broad. Stem 1.5–3 in. long, 6–10 lines thick.
Along road-sides. Alabama. May. Underwood.
The species is referable to the section Calopodes, but the tubes are more or less depressed about the stem. Peck, Bull. Torrey Bot. Club, Vol. 23, No. 10.
Edu´les—edulis, edible.
Tubes subfree, rounded-depressed around the stem, their mouths not at first reddish, but commonly white-stuffed. Stem stout, bulbous as in the Luridi but not, with a few exceptions, reticulate nor dotted with pointed scales nor red. Flesh scarcely changeable. Taste pleasant.
This tribe is not sharply limited but partakes to some extent of the characters of Calopodes and Luridi. From the former its nearly free and at first white-stuffed tubes and its generally even stem separate it, from the latter its tubes with concolorous mouths or at least with mouths not red or reddish when young will distinguish it. The species are generally of large or medium size and noted for their esculent qualities.
| Stem brownish-lilac or chocolate color | 1 | |
| Stem some other color | 2 | |
| 1. | Stem reticulated | B. separans |
| 1. | Stem not reticulated, furfuraceous | B. eximius |
| 2. Pileus viscid | B. limatulus | |
| 2. Pileus not viscid | 3 | |
| 3. | Tubes yellow with no tinge of green | 4 |
| 3. | Tubes tinged with green or becoming green where bruised | 6 |
| 4. Pileus whitish | B. æstivalis | |
| 4. Pileus not whitish | 5 | |
| 5. | Stem glabrous | B. affinis |
| 5. | Stem pubescent | B. impolitus |
| 6. Pileus becoming white-spotted where bruised | B. leprosus | |
| 6. Pileus not becoming spotted | 7 | |
| 7. | Pileus glabrous | B. edulis |
| 7. | Pileus not glabrous | 8 |
| 8. Stem reticulated, whitish or pallid | B. variipes | |
| 8. Stem even, brownish-red | B. decorus |
Peck, Boleti of the U.S.
B. sep´arans Pk. (Plate [CXVIII], fig. 1, p. 436.) Pileus convex, thick, glabrous, subshining, often pitted, pitted or corrugated, brownish-red or dull-lilac, sometimes fading to yellowish on the margin. Flesh white, unchangeable. Tubes at first nearly plane, adnate, white and stuffed, then convex, depressed around the stem, ochraceous-yellow or brownish-yellow and sometimes separating from the stem by the expansion of the pileus. Stem equal or slightly tapering upward, reticulated either wholly or in the upper part only, colored like the pileus or a little paler, sometimes slightly furfuraceous. Spores subfusiform, brownish-ochraceous, 12–15×5–6µ.