b o l e t u s s u l p h u r e u s . SULPHUR-COLOURED
BOLETUS.
BOLETUS sulphureus ; difformis dimidiates sessilis glaber imbricatus subsulphureus, came crasso al-
bescente, margine lobato, poris parvis brevibus flavescentibus.
BOLETUS sulphureus. Bulliard Champ, p . 347. t. 429. Decand. FI. Fr. ed. 3. ml. 2,p . 120. FI.
Gall. Syn. p . 24. Sowerby Fung. t. 135. With. Bot. Arr. ed. 4. ml. 4. p. 324. Purton
Midi. FI. ml. 2 ,p . 6 7 1. Hook. FI. Scot. P . II. p . 8.
BOLETUS caudicinus. Schaffer Fung. t. 131 &132.
BOLETUS citrinus. Pers. Syn. Fung. p. 524.
BOLETUS tenax. Lightf. Scot. p. 1031.
BOLETUS coriaceus. Thais. Angl.p. 25.
BOLETUS ramosus. Bull. Champ, t. 418.
Class an d Ord e r . CRYPTOGAMIA FUNGI.
[N atural Ord e r . FUNGI, Juss., Decand., Hook.]
■Ge n . Ch a r . Pileus varius. Tubuli e tp o ri teretes, integri, distinct!.
G e n . Ch a r. Pileus varying in its form. Tubes and pores rounded, entire, distinct.
F ungus magnus, crassus, aggregatus, imbricatus, om-
nino sessilis; substantia carnoso-suberosa: ad
truncos quercinos innascitur.
PlLEUS subrotundatus, convexus, undulatus, sulphureus,
demum fusco-rubescens, glaber, margine insigni-
ter lobatus, lobis non raro iterum divisis, etiam
subramosis.
Caro crassa, alba.
Pori numerosi, breves, rotundati vel angulati, faciem inferiorem
et nonnunquam superiorem omnino te-
gentes.
F ungus large, thick, clustered, imbricated, altogether
sessile; its substance between fleshy and corky,
growing from the trunks of oak trees.
P ileus somewhat round, convex, undulated, sulphur-
coloured, becoming afterwards of a brownish red,
smooth, extremely lobed at the margin, the lobes
not unfrequently divided so as to appear branched.
Flesh thick, white.
P ores numerous, short, round or angular, covering
equally the under and upper surface.
Fig. 1. A portion of the Fungus seen on the underside to show the pores, nat. size. Fig. 2. The pores highly
magnified.
Among the numerous names which have been given to this beautiful, thought not uncommon, species of Boletus,
I have retained the one by which it is known to most botanists, and which is, at the same time, the most expressive
of its general appearance, for its tint is generally o f the most delicate sulphur colour. There can, I should think,
be no doubt that Lightfoot’s B. tenax is intended for the same plant, particularly as he refers to the figure of
Schsefter, which is generally allowed to be the same.
In the older state o f this plant, the pileus becomes of a more tawny hue; and it is said, although I could not perceive
it myself, that, upon this pileus being scratched or broken, the part so injured becomes of a deep red colour.
In a fine specimen found by R. K. Greville, Esq. in the month of June 1821, growing on the trunks of old trees
near Loch Lomond, the pores were apparent on every part of the surface, the upper as well as the under; and
Sowerby tells us, that when this is not the case, and they are only evident on the under part,— if the fungus be
laid with the pileus downwards, the pores will soon be produced on the surface of it, equally with the under
side.
The same author also informs us, that on the continent this species is not unfrequently reduced to powder and
employed as tinder.