BOLETI OF THE UNITED STATES 117 
Boletus rubeus Frost 
Rep BoLetus 
Bull. Buff. Soc. 1874, p. 102 
Pileus broadly convex, very finely appressed subtomentose, 
bright brick-red when young, becoming mottled with red and 
yellow, yellow under the cutecle, the thin margin at first in- 
flexed, then horizontal, curved upwards when old, flesh pale- 
yellow, changing to blue where wounded ; tubes adnate or 
slightly depressed around the stem, lemon-yellow and stuffed 
when young, becoming yellow and sometimes red at the 
mouths ; stem small, often flexuous, colored like the pileus, 
reddish within, white-tomentose at the base; spores 00035 
to .0005 in. long, .00016 to .0002 broad. 
Pileus 2 to 4 in. broad; stem 1 to 3 in. long, 3 to 5 lines 
thick. 
Deep woods. Rare. New England, Frost. 
This is apparently too closely related to B. chrysenteron, 
and it also resembles B. dzcolor. The red mouths of the 
tubes are suggestive of the Luridi, but as they occur only 
in mature plants and are not constant, they are scarcely 
sufficient to place the species in that tribe. The stuffed 
mouths of the young tubes connect the species with the 
Edules but the adnate tubes prevent its association with 
them. 
Boletus subtomentosus L. 
SUBTOMENTOSE BoLETUS. YELLOW-CRACKED BOLETUS 
Hym. Eur. p. 503. Syl. Fung. Vol. VI, p. 14 
Pileus convex or nearly plane, soft, dry, vz/lose-tomentose, 
subolivaceous, concolorous beneath the cuticle, often rimose- 
areolate, flesh white or pallid; tubes adnate or somewhat 
depressed around the stem, yellow, their mouths large, 
angular; stem stout, somewhat ribbed-sulcate, scabrous or 
