mass in cooking. Some species also have a viscid or slimy surface 
to the cap, and this causes earth, sticks and leaves to adhere tena- 
ciously to it. It is therefore well to peel such caps before cooking 
them. 
ANALYTICAL TABLE OF SPECIES OF BOLETUS. 
Cap viscid when moist, 1. 
Cap not viscid, 3. 
1. Stem having a collar, 2. 
1. Stem destitute of a collar, B. granulatus, 
2. Stem dotted above the collar, B. luteus. 
2. Stem dotted both above and below the collar, 
B. subluteus. 
3. Stem roughened with prominent colored dots or 
scales, 4, 
3. Stem with no dots or scales, 5. 
4. Margin of the cap with adhering fragments 
of a membranous veil, B. versipellis. 
4, Margin of the cap naked, B. scaber. 
5. Stem solid, B. edulis. 
5. Stem hollow, B. castaneus. 
The yellow-brown boletus, Boletus luteus, is one of our rarest 
species. I have seen it in but one locality in New York. Its cap 
is broadly convex or nearly flat, viscid when moist and of a pecu- 
liar yellowish-brown color, with a slight reddish tint and com- 
monly varied with very obscure streaks or stains of a deeper hue. 
The flesh is white, often tinged with yellow in old plants. The 
mass of pores is at first concealed by the membranous veil, 
which stretches from the stem to the margin of the cap; but 
when this is ruptured by the expansion of the cap, they are seen 
to be yellow, but with advancing age they assume dingy ochra- 
ceous hues. The stem is shorter than the diameter of the ex- 
panded cap, solid, and furnished with a membranous collar which 
often seems to extend downwards on the stem somewhat like a 
sheath. It is marked with brown dots above the collar. It is 
found under pine trees in autumn. 
“Edible and highly esteemed;” “its flesh is very tender;” 
is excellent,” are some of the estimates made of this fungus by 
European writers. 
The small yellowish boletus, Boletus subluteus, is a much more 
common species, but one so closely related to the Yellow-brown 
boletus that possibly it has often been mistaken for it. It differs 
from it in having a more slender stem, which is marked with 
brown or blackish dots both above and below the collar. The 
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