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

SUILL US

59

Tubes 6-10 mm deep (often deeper than depth of context), adnate
to short-decurrent, pale olive yellowish young, becoming "light ochraceous-buff" (pale yellow) to orange-buff; pores round at first and 1-2 per
mm, becoming somewhat angular in age, yellowish with brownish spots
from clusters of cheilocystidia.
Stipe 4-7 cm long, 6-12 (16) mm thick at apex, equal or enlarged
downward, solid, cortex ochraceous, central area paler, soon blackening
around the wormholes; surface pinkish ochraceous at first and dotted
above and below the baggy annulus with vinaceous dots which slowly
blacken; annulus with a thick inner layer of soft floccose tissue and with
a gelatinous layer over the exterior, in young specimens the lower margin flared outward in a rather characteristic manner, upper edge flared
even more, in age collapsing and rather inconspicuous.
Spore deposit dull cinnamon after moisture escapes; spores 7-10 X
2.3-3.2 u, smooth, pale greenish hyaline to yellowish in KOH, pale cinnamon to yellowish in Melzer's, narrowly oblong to narrowly elliptic in
face view, inequilateral in profile, with the apical end slightly turned up
dorsally.
Basidia 4-spored, 16-20 X 5-6.5 Jp, clavate, nearly hyaline in KOH,
yellowish in Melzer's. Pleurocystidia in fascicles with brown incrusting
material surrounding the bundle at the level of the hymenium as revived
in KOH, when fresh and mounted in 2.5 percent KOH dark lilac to
lilac-brown; individual cystidia 30-45 X 7-11 /a, clavate, hyaline or with
colored content as revived in KOH. Cheilocystidia similar to pleurocystidia or obfusoid, many with dark brown content as revived in KOH,
colored like pleurocystidia in KOH when fresh. Caulohymenium with a
broad gelatinous subhymenium, with numerous fascicles of caulocystidia
surrounded by copious bister (as revived in KOH) amorphous pigment;
also some areas of hymenium incrusted with similar pigment but no
cystidia seen in them; caulobasidia in an interrupted hymenium with
subgelatinous filamentose hyphal projections among them but these lacking apical differentiation into specialized types of cells.
Tube trama with a colored to hyaline narrow central strand of
parallel floccose hyphae, from this gelatinous hyphae diverge to the
subhymenium. Epicutis of pileus a tangled collapsing trichodermium of
narrow (2-4.4 pin diameter), branched, hyaline to yellowish hyphae,
considerable debris present in the layer. Clamp connections none.
Habit, habitat, and distribution.-Gregarious under jack pine (P.
banksiana) from late August into September, not common but often in
quantity during wet seasons. We have found it most abundantly in jack
pine bogs in deep moss.