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

LECCINUM

131

KOH and Melzer's, fusoid-ventricose, subacute at apex. Cheilocystidia
similar to pleurocystidia but many with brown content in KOH. Caulocystidia in large patches of caulobasidia, 36-56 X 9-18 /, a fair number
fusoid-ventricose but many clavate to mucronate, with dull brown walls;
caulobasidia numerous and sporulating, 2-, 3-, or 4-spored, dull brown in
KOH; spores from these basidia 8-10 X 4-5.5 J, ellipsoid to ovoid,
hyaline to slightly colored and very different from those borne on the
basidia of the hymenophore.
Pileus cutis a layer of tangled hyphae with hyaline to brownish
bands of incrusing material on some of the hyphae but mostly roughened as in L. insigne (fig. 15), with some cells merely asperulate, content smoky brown in KOH from a homogeneous content, in Melzer's
dingy orange-brown and homogeneous to reticulate-coagulated, no pigment globules seen, the hyphae tubular to the inflated fusoid end-cell or
the latter bullet-shaped, the enlarged cells up to 20 j broad, some cells
disarticulating, walls variously ornamented but a minority smooth;
amyloid particles scattered in the mount. Context hyphae hyaline or
with yellow walls in Melzer's, the content not distinctively colored.
Clamp connections absent.
Habit, habitat, and distribution.-Solitary under aspen, Haven Hill,
Oakland County, October, apparently rare.
Observations.- For a comparison with L. subatratum see that
species.
60. Leccinum uliginosum Smith & Thiers, sp. nov.
Illus. P1. 64.
Pileus 5-15 cm latus, convexus, siccus, demum rimulosus, fuscus.
Contextus albidus tactu roseolus, tarde fuscus. Tubuli 1-1.5 cm longi,
pallidi; pori pallidi tactu ochracei demum sordide brunnei. Stipes 9-16
cm longus, 1-2.5 cm crassus, punctato-squamulosus, squamulae fuscae.
Sporae 14-17 (18) X 3.5-5,u. Specimen typicum in Herb. Univ. Mich. conservatum est; prope Wycamp Lake, Emmet County, August 3, 1968,
legerunt Thiers et Smith 75837.
Pileus 5-15 cm broad, convex becoming broadly convex; surface
dry and unpolished and in age often rimulose, color pale to dark fuscous
("hair-brown" to "benzo-brown" —a violaceous-fuscous), in age finally
merely drab-gray near the margin; margin exceeding the tubes by 1-2 mm
(but not becoming lobed in the typical manner as in species referred
to in section Leccinum). Context white, when cut slightly reddish
(young specimens), then changing to bluish fuscous, FeSO4 causing a
change to olivaceous; odor and taste not distinctive.