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

LECCINUM

151

vinaceous then avellaneous and finally violaceous-fuscous, with FeSO4
bluish; odor and taste not distinctive.
Tubes 1-1.5 cm long, adnate at first, becoming depressed, pallidolivaceous to dull brown where cut; pores minute, olivaceous-pallid,
staining dark brown where severely bruised but olive yellowish where
lightly bruised.
Stipe 11-15 cm long, 12-23 mm thick, solid, fibrous, hard, pallid
within, when cut slowly staining fuscous in streaks, no blue or red stains
developed on specimens observed; surface whitish with coarse blackish
reticulation and squamules or points, when dried with an overall grayish
ground color.
Spores dark yellow-brown ("snuff-brown") in deposits, 14-16 X
4.5-5.5,c, subfusoid in face view, in profile inequilateral (often rather
ventricose), suprahilar depression broad; walls slightly thickened, color in
KOH dingy brownish ochraceous, not much different in Melzer's.
Basidia 4-spored, 18-22 X 9-10, clavate, hyaline in KOH and
Melzer's. Pleurocystidia 38-52 X 9-14 p, fusoid-ventricose, content usually brownish to bister in KOH and bister to violaceous-bister in Melzer's,
large bister or violaceous-bister laticiferous elements present in mounts
revived in Melzer's. Cheilocystidia 30-45 X 5-9 a, clavate to fusoidventricose, ochraceous in KOH. Caulocystidia voluminous, up to 50-60
X 20 p, clavate to obclavate or mucronate more rarely fusoid-ventricose,
content bister in KOH.
Hyphae of pileus brownish at times with some cells with dingy
brown walls as seen in KOH, hyphae commonly disarticulating; hyphal
width, cell size, and ornamentation as in L. insigne. Context hyphae
when revived in Melzer's typically orange to red but also with a few
fuscous (amyloid?) masses or particles. Clamp connections absent.
Habit, habitat, and distribution.-Solitary to scattered, Sugar
Island, and Tahquamenon Falls State Park, Chippewa County, July to
September.
Observations.-The pilei dry to an olive-gray. The fresh pilei are
ocher-yellow to paler at first with a gray shadow from the surface
fibrils, but gradually get duller as they mature. When old they resemble
those of L. cinnamomeum It differs slightly from L. insigne, to which it
is most closely related, in the color of the fresh young pileus, in the
KOH reaction of the content of the cuticular cells, and in the darkcolored laticiferous elements as mounted in Melzer's.