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

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THE BOLETES OF MICHIGAN

Basidia 4-spored, 17-23 X 8-11 p, hyaline in KOH. Pleurocystidia
abundant, 40-60 X 10-15 u, fusoid-ventricose with blunt apex but neck
often elongated and flexuous, thin-walled, hyaline in KOH at first but
when revived in KOH having a dingy yellow-brown content, and in
Melzer's dark yellow-brown. Cheilocystidia 23-34 X 6-11 u, mostly
fusoid-ventricose with narrow necks (about 2 gp wide) and apex subacute,
ochraceous in KOH. Caulocystidia a mixture of ventricose, mucronate,
and clavate cells 27-40 X 8-12 l and larger ones up to 15-20 p wide
scattered in each fascicle, their content pale brownish ochraceous in
KOH.
Cutis of pileus a tangled layer of epicuticular hyphae with subcutis
of merely interwoven hyphae; the coarse fibrils of the epicutis 8-15 u
wide with some cells 40-120 u or more long and some of these with
minutely roughened walls, the end-cells often ovate-pointed (bulletshaped), no pigment globules present in Melzer's, the colored cells with
content amorphous-reticulate and orange-brown, the cells tending to disarticulate in age and at this time more of them showing slight wall
irregularities. Context of hyaline hyphae in KOH and Melzer's. Clamp
connections absent.
Habit, habitat, and distribution.-Scattered in an aspen thicket
which had a ground cover of willows, Highland Recreation Area, Oakland County.
Observations.-This species is probably much more frequent in
occurrence than the material to date indicates. L. laetum is near L.
insigne by virtue of the features of the broad epicuticular hyphae, but is
distinct by the olive-colored spore deposit, by the viscid base of the
stipe, the relatively weak stipe ornamentation, and the basically orangeochraceous of the pileus. About 50 basidiocarps represent the type collection.
72. Leccinum ochraceum Smith, Thiers, & Watling
Mich. Bot. 5:162. 1966
Illus. P1. 72.
Pileus 5-12 cm broad, convex becoming broadly convex, the margin appendiculate at first; surface dry and unpolished to appressed-fibrillose, in some with appressed-fibrillose squamules near the margin; color
varying from ochraceous-yellow with grayish overtones from fibrils or
dingy tan ("pinkish buff') over the disc, or becoming pinkish cinnamon
to pale dingy cinnamon. Context thick, white, when cut changing to