The boletes of Michigan, by Alexander H. Smith and Harry D. Thiers.

SUILL US

71

Stipe 4-6 cm long, 8-10 mm thick, solid, narrowed downward to a
subradicating base, within lemon-yellow in the apex and olivaceous in
the base, surface lemon-yellow but staining dull olivaceous where
handled, near apex with raised areas of glandulae but the dots concolorous with remainder of the surface or in age finally brownish; copious
basal mycelium pale yellow.
Spores 7-9 X 2.6-3 i, smooth, in profile narrowly inequilateral, in
face view elongate-subfusiform to nearly oblong, pale yellowish in KOH,
pale tawny in Melzer's. Basidia 4-spored. Pleurocystidia in fascicles,
when' revived in KOH with vinaceous-brown content and vinaceous-brown incrusting debris around the cluster, individual cystidia
cylindric to narrowly clavate, 34-47 X 5-9 u. Pileus cutis of appressed,
hyaline, narrow, tubular, gelatinous hyphae lacking clamp connections.
Habit, habitat, and distribution. -Scattered under aspen-birch-spruce
stands near edge of swampy area, northwest corner of Montmorency
County. July 26, 1967. Smith 74648.
Observations.-In the dried state the glandular dots are very conspicuous on the stipe. The yellow of the pileus is preserved in drying-an
unusual feature in this group of species. Frost did not mention the stipe
as staining olive for his Boletus unicolor, but we are assuming that this
character was overlooked. There was no veil along the pileus margin and
not any significant development of fibrils on the pileus, so it is not
likely that our material represents a variant of S. hirtellus. S. subaureus
is closest but the stipe in it has a ferruginous to orange zone in the base
when cut, and the color changes on the surface are to brownish. Also,
the basal mycelium is white, and the pileus has appressed tomentum
over the surface to some extent as observed on young basidiocarps.
27. Suillus granulatus (Fries) Kuntze
Rev. Gen PI. 32:535. 1898
Boletus granulatus Fries, Syst. Myc. 1:385. 1821.
Rostkovites granulatus (Fries) Karsten, Rev. Mycol. 3:16. 1881.
Viscipellis granulatus (Fries) Qualet, Enchir. Fung. p. 156. 1886.
Ixocomus granulatus (Fries) Qualet, Fl. Myc. Fr. p. 412. 1888.
Illus. PI. 32.
Pileus 5-11 (15) cm broad, becoming broadly convex, viscid to
glutinous when wet, glabrous or streaked or spotted with "cinnamon"
on a pale buff ground color, in age more or less cinnamon overall or
"orange-cinnamon," immature pilei often whitish for a long time, margin