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

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THE BOLETES OF MICHIGAN

193. Boletus rufocinnamomeus Smith & Thiers, sp. nov.
Pileus 4-12 cm latus, convexus, siccus, subtomentosus, lateritius
demum cinnamomeus. Contextus luteus tactu caeruleus. Tubuli adnati,
lutei tactu caerulei; pori cinnabarini. Stipes 8-12 cm longus, 12-18 mm
crassus, pruinosus, deorsum rubeus, sursum luteus, non-reticulatus.
Sporae 14-17 X 4.5-6.5 g. Caulocystidia 60-200 X 7-15 gt, subaciculata
vel fusoide ventricosa. Specimen typicum in Herb. Univ. Mich. conservatum est; prope Burt Lake, Cheboygan County, August 11, 1969,
legit Smith 77831.
Pileus 4-12 cm broad, convex becoming plane; surface dry and
velvety to subtomentose, becoming unpolished, dull brick-red ("Sanford's brown) when young but with an ochraceous overtone from an
evanescent bloom, in age finally dingy cinnamon (near "Sayal-brown"),
when dried near "Verona-brown" (not yellow); context yellow but
when cut almost instantly blue, taste acidulous, odor none, FeSO4 on
blue stained areas causing a change to yellow and finally olive.
Tubes 9-15 mm deep, adnate, becoming depressed at the stipe,
yellow; pores 1.5-3 per mm, bright flame-scarlet at maturity, maroon-red
when young, quickly blue where injured.
Stipe 8-12 cm long, 12-18 mm at apex, equal, solid, in upper
portion yellow within, rusty rose near base, instantly blue when cut;
surface yellow above, at or near the base coated with yellow mycelium,
pruinose above with the pruina orange-cinnamon to brown, not at all
reticulate or pseudoreticulate.
Spores olive-brown in deposit, 14-17 X 4.5-6.5 u, smooth, apex
with a distinct though very minute pore, in profile view ventricoseinequilateral, in face view subfusoid, in KOH pale clay color, in Melzer's
dingy yellow-brown, wall less than 0.3 u thick.
Basidia 4-spored, clavate, 8-11 gt broad. Pleurocystidia rare to scattered, readily collapsing, fusoid-ventricose with obtuse apex (not revived
well enough to measure); hymenium readily gelatinizing. Cheilocystidia
26-33 X 7-11,, subfusoid, dingy tan to hyaline in KOH. Caulocystidia
abundant, many 60-200 X 6-15, wide, seta-like to fusoid-ventricose,
apex acute to subacute, content hyaline to yellow in KOH, often
secondarily septate, walls thin and smooth; some cystidia not proliferated and measuring 36-58 X 10-15, some clavate and 25-40 X
10-16 g, most cells in the caulohymenium golden ochraceous in KOH.
Tube trama very gelatinous, of the Boletus subtype. Pileus cuticle a
turf of narrow (2-5 p) hyphae soon grouped into fascicles, the hyphae
100-300, long, septa sparse, cells tubular, end-cells tubular to slightly