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

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THE BOLETES OF MICHIGAN

pallid where the context shows, on drying the surface blackish with an
undertone of yellow. Context pallid to yellowish pallid, soon stained
vinaceous-gray where cut, finally distinctly vinaceous near apex of stipe,
green with FeSO4 and distinctly orange-ochraceous with KOH; odor and
taste not distinctive.
Tubes about 10 mm deep, depressed around the stipe, grayish
brown in sections; pores about 2 per mm, pale olive-ochraceous and
staining brown where injured, yellow when dried.
Stipe 5-7 cm long, 10-15 (17) mm thick at apex, equal to narrowed at base at maturity, solid, olive-buff and brownish resinous-furfuraceous from discolored glandular papillae, more or less squamulose
below and at base scarlet to dull red in at least some American specimens, interior pallid to olive-buff, brown around the larval tunnels,
staining vinaceous when cut, cortex yellowish.
Spore deposit honey-yellow; spores 14-20 X 6-9 p, smooth, in face
view broadly ventricose-fusiform to fusiform, in profile broadly inequilateral, dingy yellow-brown in KOH, more rusty tan in Melzer's but not
dextrinoid, wall about 0.5, thick in Melzer's but appearing thicker in
KOH, apex with a minute pore in some spores.
Basidia 4-spored or some 1-spored, (18) 20-28 X 9-13 u, short-clavate with a broad base or more elongate-clavate and with a narrow
(3-4 p) base, hyaline in KOH, yellowish in Melzer's but with no distinctive content in either medium. Pleurocystidia rare, 38-62 X 9-15 t,
thin-walled or wall slightly thickened and distinctly refractive, smooth,
hyaline to yellowish in either KOH or Melzer's. Cheilocystidia 18-36 X
6-12,, fusoid-ventricose to clavate-mucronate, content dingy yellowbrown in KOH, walls thin to slightly thickened (0.3it), and slightly
refractive as in the pleurocystidia. Caulocystidia 30-66 X 7-15 (20)/a,
narrowly fusoid-ventricose with flexuous neck and often with a short
narrow subacute to rounded apical extension, or broadly fusoid-ventricose to clavate-mucronate, content hyaline to yellowish and walls
slightly thickened and refractive or not in KOH.
Tube trama with a thin central scarcely gelatinous strand of thinwalled hyphae from it on either side a slight divergence of the hyphae
giving an obscurely bilateral effect; subhymenium cellular to filamentose.
Pileus trichoderm of tangled hyphae 8-15 au wide, the cells of various
lengths but some inflated to 20-30 X 14-20 u, not forming a chain of
subglobose cells at the distal end as in L. rugosiceps although the endcell is often reduced in size as in that species, content ochraceous-brown
in KOH and dark dingy orange-brown in Melzer's. Context hyphae beneath the trichodermium with dark brownish orange content as revived
in Melzer's. Clamp connections absent.