145 
Grassy woods. Auburn, Alabama. July. Underwood. 
A small but pretty species of a yellow color throughout. It is 
remarkable for its hollow stem, which is suggestive of the specific 
name. It is referable to the tribe Viscipelles. 
BOLETUS FRATERNUS. 
Pileus convex, becoming plane or depressed, slightly tomen- 
tose, deep red when young, becoming dull red with age, flesh yel- 
low, slowly changing to greenish-blue where wounded; tubes 
rather long, becoming ventricose, slightly depressed about the 
stem, their walls sometimes slightly decurrent, the mouths large, 
angular or irregular, sometimes compound, bright yellow, quickly 
changing to blue where wounded; stem short, caespitose, often ir- 
regular, solid, subtomentose, slightly velvety at the base, pale red- 
dish yellow, paler above and below, yellow within, quickly chang- 
ing to dark green where wounded; spores .0005 in. long, .00025 
broad. Piieus I-1.5 in. broad; stem 1I-1.5 in. long, 3-6 lines 
thick, 
Shaded streets. Auburn, Alabama July. Underwood. 
The species is apparently allied to R. rudeus, but is very dis- 
tinct by its small size, caespitose habit, color of the flesh of the 
stem and by the peculiar hues assumed where wounded. When. 
the pileus cracks the chinks become yellow as in 2. sudbtomentosus. 
The species belongs to the tribe Subtomentosi. 
BoLetus UNDERWOODII. 
Pileus rather thin, convex, becoming nearly plane, slightly 
velvety, bright brownish-red, becoming paler with age, flesh yel- 
low, changing to greenish-blue where wounded; tubes adnate 
or slightly decurrent, greenish-yellow, becoming bluish where 
wounded, their mouths very small, round, cinnabar red, becoming 
brownish orange ; stem equal or slightly tapering upward, some- 
what irregular, solid, yellow without and within; spores .coo4— 
- 0005 in. long, .0002 broad. Pileus 2-3 in. broad; stem 3-4 in. 
long, 4-6 lines thick. : 
Grassy woods. Auburn, Alabama. July. Underwood. 
The species is remarkable for its adnate or subdecurrent tubes 
in which it departs from the character of the tribe to which it be- 
longs according to the colors of the tubes. 
BOLETUS PARVUS. 
Pileus convex, becoming plane, often slightly umbonate, sub- 
tomentose, reddish, flesh yellowish white, slowly changing to — 
