| Pileus viscid | 1 | |
| Pileus dry | B. Russelli | |
| 1. | Stem red in the depressions, tubes tinged with green | B. Morgani |
| 1. | Stem pale-yellow, tubes not greenish | B. Betula |
| Peck, Boleti of the U.S. |
B. Rus´selli Frost—Russell’s Boletus. (Plate [CXVIII], fig. 2, p. 436.) Pileus thick, hemispherical or convex, dry, covered with downy scales or bundles of red hairs, yellowish beneath the tomentum, often cracked in areas. Flesh yellowish, unchangeable. Tubes subadnate, often depressed around the stem, rather large, dingy-yellow or yellowish-green. Stem very long, equal or tapering upward, roughened by the lacerated margins of the reticular depressions, red or brownish-red. Spores olive-brown, 18–22×8–10µ.
Pileus 1.5–4 in. broad. Stem 3–7 in. long, 3–6 lines thick.
This is distinguished from the other species by the dry squamulose pileus and the color of the stem. The latter is sometimes curved at the base. Peck, Boleti of the U.S.
B. Russelli occurs in the West Virginia mountains, where I found and ate it in August, 1883. Though solitary in its method of growth, it is frequent in many parts of Pennsylvania, among leaves in mixed woods. August to October.
Taste when raw, sweet, mild. Cooked it is rather soft, tasty. Tubes and stem should be removed.
B. Mor´gani Pk. Pileus convex, soft, glabrous viscid, red or yellow, or red fading to yellow on the margin. Flesh whitish tinged with red and yellow, unchangeable. Tubes convex, depressed around the stem, rather long and large, bright-yellow becoming greenish-yellow. Stem elongated, tapering upward, pitted with long, narrow depressions, yellow, red in the depressions, colored within like the flesh of the pileus. Spores olive-brown, 18–22µ long, about half as broad.
Pileus 1.5–2.5 in. broad. Stem 3–5 in. long, 3–6 lines thick.
Rocky hillsides in woods of deciduous trees. Kentucky, Morgan.
In wet weather the anastomosing ridges of the stem swell and become broadly winged, thereby giving the stem a peculiar lacerated appearance. The glabrous viscid pileus and the coloration of the stem distinguish the species. Peck, Boleti of the U.S.