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

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THE BOLETES OF MICHIGAN

3. Spores 14-18 x 5-6.5 A; stipe pruinose...............B. sphaerocystis
3. Spores 3-5 u wide and less than 15, long..................... 4
4. Terminal cells (or many of them) in the form of a tubular extension
from the parent cell, often up to 100 M long............. B. hortoni
4. Terminal cells of cuticular layer not elongated as in above choice................................... B su ga rpB. subglabripes
168. Boletus longicurvipes Snell & Smith
Journ. Elisha Mitchell Sci. Soc. 56:325. 1940
Illus. P1. 125 (lower).
Pileus 1.5-6 cm broad, obtuse to convex becoming broadly expanded; surface viscid from a tenacious separable pellicle, glabrous;
color reddish orange to tawny or dingy ochraceous, often with a reddish
brown reticulum, at times olivaceous in age. Context soft, white, becoming pallid yellowish, unchanging when injured, odor and taste mild;
FeSO4 no reaction.
Tubes 9-12 mm deep, adnate, becoming depressed, not changing
when bruised; pores small (about 2 per mm), pale yellow but in age
sordid greenish gray.
Stipe 5-9 cm long, 8-15 mm thick, equal or gradually enlarged
downward, solid, white within becoming yellowish, unchanging; surface
whitish above, pale pinkish brown below, furfuraceous to scabrouspunctate (or appearing subreticulate from breaking up of the fibrillose
coating), the ornamentation becoming dull reddish in age or on drying.
Spores 13-17 X 4-5 /, smooth, narrowly subfusiform to oblong in
face view, inequilateral in profile, dingy honey color in KOH, in
Melzer's near ochraceous-tawny, with a well-defined mucilaginous outer
sheath, the wall 0.5, thick and with a thin spot at apex.
Basidia 4-spored, 20-26 X 9-12 jI, clavate, hyaline in KOH, yellowish in Melzer's. Pleurocystidia scattered, 33-50 X 9-14 u, fusoid-ventricose, hyaline in KOH and yellowish in Melzer's, content not distinctively
colored.
Pileus cuticle a turf of narrowly clavate hyphal ends 4-10 Iu broad
with a layer of slime above them, ochraceous in KOH. Hyphae of cutis
yellowish in Melzer's; those of the subcutis the same color or paler.
Clamp connections none.
Habit, habitat, and distribution.-Known in Michigan from a collection by Bill Isaacs at Muskegon, September 15, 1963, and another by
Victor Potter from near Ithaca.