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

306

THE BOLETES OF MICHIGAN

3812, 7730, 7762, 7849, 7983, 8134, 8153, 8243, 8371, 8445, 10043,
10157, 10214, 11207, 11887, 12090, 12220, 12683, 13977. Livingston:
Smith 7035, 18468, 18623. Oakland: Smith 6778, 7067, 7215, 18534,
73290. Ogemaw: Shaffer 2692, 2710. Washtenaw: Kauffman 7-26-14,
8-19-21; Homola 1629; Shaffer 2649, 2661, 2753, 2791, 2823; N. J.
Smith 92A; A. H. Smith 1529, 1685, 62647, 64153, 72468, 73118;
Thiers 4565, 4582, 4583, 4587, 4603.
162. Boletus huronensis Smith & Thiers, sp. nov.
Illus. Pls. 117 (lower), 118 (left).
Pileus 8-14 cm latus, late convexus, siccus, impolitus, sordide cinnamomeus vel luteo-brunneus. Contextus pallide luteus, tactu tarde
viridi-caeruleus. Tubuli 1-1.5 cm longi, obscure lutei, pori lutei tactu
caerulei. Stipes 7-10 cm longus, 1.8-4 cm crassus, sursum luteus,
deorsum tactu brunneus. Sporae 12-15 X 3.54.5 u. Specimen typicum
in Herb. Univ. Mich. conservatum est; prope Canyon Lake, Marquette
County, August 10, 1968, legit J. Ammirati 2188.
Pileus 8-14 cm broad, obtuse to convex, margin inrolled, expanding to plano-convex, margin often irregular at first and sometimes remaining so, surface dry and matted-fibrillose or obscurely velvety at
first; color dull yellow-brown ("snuff-brown") to dull cinnamon
("Sayal-brown"), not areolate at any stage, when dried a grayish cinnamon-buff. Context thick (2-3.5 cm), pale yellow and slowly staining
blue when bruised, with a reddish brown line under the cuticle, reddish
tints developing on context after blue has faded; with FeSO4 grayish
green to bluish gray; odor and taste not distinctive.
Tubes 0.5-1.5 cm deep, nearly free from stipe, dull yellow, staining blue where injured; pores minute about 2 per mm, yellow to oliveyellow, when bruised staining greenish blue and finally reddish brown.
Stipe 7-10 cm long, 1.8-4 cm thick at apex, clavate and up to 5
cm thick at base, solid, firm, yellow above, paler to whitish below,
brownish orange around larval holes, in the base watery-streaked and
watery to grayish yellow; surface unpolished and evenly pale bright
yellow ("baryta-yellow"), brownish where handled, not reticulate.
Spore deposit olive; spores 12-15 X 3.54.5 I,, smooth, apex lacking a pore, in face view suboblong to obscurely fusoid, in profile mostly
obscurely inequilateral, color bright olive-yellow in KOH, in Melzer's
grayish at first (weakly amyloid?), wall about 0.2 p, thick.
Basidia 4-spored, 8-11 u in diameter, clavate, hyaline in KOH, with
a large oil droplet, yellowish in Melzer's. Pleurocystidia 33-57 X 9-15.u,