MYCOLOQICAL NOTES. 
CINCINNATI, O. 
BY C. G. LLOYD, 
No. IO. 
SEPTEMBER 1902 
182—BOLETUS BETULA. 
Pileus firm, 
lose, often rimose, 
By H. C. Beardseee. 
hemispherical to convex, red tomentose or squamu- 
red or yellowish-red ; flesh firm, yellowish ; tubes 
adnate, often somewhat depressed around the 
stipe, dingy yellow or yellowish-green, mouths 
rather large ; stipe long, equal or tapering up¬ 
ward, shaggy with rough winged reticula- 
lations. Pileus \ x / 2 to 3 in. broad, stipes3-10 
in. long. 3-6 in. thick. 
In woods, very common on the Ashe¬ 
ville plateau. 
Three species of shaggy-stiped Boleti 
have been described by American Mycologists. 
B. Betula was first described by Schweinitz, 
but although he recorded it as common in 
North Carolina and Pennsylvania, it does 
not seem to have been recognized since his 
day, the shaggy-stiped species which is found 
quite generally in the northern states, having 
been universally referred to a species later de¬ 
scribed by Frost as Boletus Russelli. 
As they are described these species 
Fig. 57. Boletus Betula. would seem to be fairly distinct. B. Betula 
(Section young plant.) has the pileus “viscose and shining in wet 
weather,” the f ‘stipe attenuated downward,” and the “tubes yellow.” 
B. Russelli has the “pileus dry, tomentose squamulose or fasciculately 
red pilose,” the “stipe equal or tapering upward,” and the “tubes 
dingy yellow or yellowish-green.” 
The plant which is abundant on the Asheville Plateau is clearly 
B. Russelli. It corresponds perfectly with Frost’s excellent descrip¬ 
tion and with the plant which we have found in Ohio, Illinois, Maine, 
and New York. 
Continuous observation of it during the summer however, has 
convinced us that it is also B. Betula. The pileus is normally dry, 
but during the continuous rains to which this region is liable during 
parts of the summer, it takes on the features described by Schweinitz. 
The pileus becomes “viscose and shining, and develops a set of retic¬ 
ulating cracks so that it might well be termed “tesselately rimose.” 
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