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

BOLETUS

281

red color of the cap trama in Melzer's, the strongly amyloid spores (for
a bolete), their larger size, and the much deeper tubes. It is likely that
the pileus would show some degree of viscidity when wet.
147. Boletus pseudosensibilis Smith & Thiers, sp. nov.
Illus. Pls. 100-111.
Pileus 6-14 cm latus, late convexus, ferrugineus, siccus, impolitus.
Contextus luteus, tactu caeruleus. Tubuli 5-8 mm longi, lutei, tactu
caerulei. Stipes 8-16 cm longus, 1.5-3 cm crassus, sursum luteus,
deorsum sordide ferruginus, non-reticulatus. Sporae 9-12 X 3-4 J. Specimen typicum in Herb. Univ. Mich. conservatum est; prope Gun Lake,
Barry County, August 22, 1966, legit Smith 73128.
Pileus 6-14 cm broad, convex expanding to plane, surface glabrous
and unpolished, not velvety at any stage, dry, color dull ferruginous but
the red soon fading and pileus more or less dingy yellow-brown ("cinnamon-buff' to "Sayal-brown"), the yellow flesh conspicuous as pileus
becomes areolate, when dried the pilei dingy yellow-brown to "Isabella
color" (with yellow in the cracks and as a pervading undertone). Context bright yellow, quickly azure-blue when cut, thick, firm, odor and
taste mild, NH40H blue on the cuticle then changing to dull purplish,
KOH brownish on context, guaiac no reaction.
Tubes shallow (5-8 mm long), subdecurrent to adnate on stipe,
bright ocher-yellow staining blue and then changing to brown when
injured; pores small (-1-3 per mm), staining blue then brown at maturity, if undamaged slowly becoming olive-ocher, lemon-yellow when
young.
Stipe 8-16 cm long, 1.5-3 cm at the flared apex, often equal or
nearly so, solid yellow within above, vinaceous-red in the base and
around larval tunnels; surface naked and glabrous, not reticulate anywhere, apex pale lemon and duller yellow as dried, base rusty rose and
purplish red as dried, ochraceous mixed with rose in midportion.
Spore deposit olive, becoming olive-brown; spores 9-12 X 3-4 u,
smooth, apex lacking a pore, wall about 0.2 / thick, shape in face view
subfusiform to suboblong, in profile narrowly inequilateral to suboblong,
the suprahilar depression shallow to almost absent; yellow in KOH, in
Melzer's dingy yellowish.
Basidia 4-spored, 22-28 X 7-9 l, clavate, yellowish to hyaline in
KOH or Melzer's. Pleurocystidia 36-58 X 8-14 Mu, fusoid-ventricose with
narrow often flexuous neck, smooth, thin-walled, content long remaining
ochraceous in KOH and Melzer's. Cheilocystidia similar to pleurocystidia