BOLETI OF THE UNITED STATES 103 
This is sometimes rimose-areolate and sometimes the margin 
is very obtuse by the elongation of the tubes. In the form 
reported as BL. szstotrema the mouths of the tubes near the 
stem are unusually large, unequal and sinuate. The spores 
of the European plant are described as brown; in our plant 
they have a ferruginous tint when seen in a mass on white 
paper. 
PULVERULENTI 
Pileus clothed with a yellow dust or a yellow pulverulent 
tomentum. Stem more or less yellow pulverulent, neither 
bulbous nor distinctly reticulated. 
The species which constitute this tribe are easily distin- 
guished from all others by the sulphur-colored pulverulence 
which coats the pileus and stem like a universal veil. They 
appear thus far to be peculiar to this country. Though 
strongly resembling each other in the tribal character they 
are very diverse in other respects. One species, by its vis- 
cidity, Connects with the preceding tribe; another by its 
differently colored tube mouths is related to the Luridi; and 
the third is peculiar in its ligneous habitat. 
Plank srowine- Onethe rounds fas ecisgs-icte seo foes fee ws I 
EF ATO LOW INGs OME WiOOG ere tastes ila aataeraletste 0 of aie seer B. hemichrysus. 
ii; HOSS AGIMAINE,) Oh ONS CODE. ..25-ccccnesous essen waits B. Ravenelii. 
1. Tubes free, with red mouths..... Fate smite tein Macey al aate B. auriflammeus. 
Boletus hemichrysus bP. & C. 
HALF-GOLDEN BOLETUS 
Ann. Mag. Nat. Hist. 1853, p. 13. Grevillea, Vol. I, p. 35 
Pileus convex, at length plane or irregularly depressed, 
floccose-squamulose, covered with a yellow powder, some- 
times rimose, bright golden-yellow, flesh thick, ye//ow , tubes 
adnate or decurrent, yellow, becoming reddish-brown, the 
mouths large, angular; stem short, zrregular, narrowed below, 
sprinkled with a yellow dust, yellowish tinged with red; 
5 
