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

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THE BOLETES OF MICHIGAN

vinaceosanguineus, pruinosus, non-reticulatus. Sporae 14-17 X 4-5.5 ju,
amyloideae. Specimen typicum in Herb. Univ. Mich. conservatum est;
prope Waterloo, August 13, 1968, legit Ruth Zehner 349.
Pileus 6-15 cm broad, broadly convex, glabrous, surface even (not
rimose or areolate in old caps), color deep vinaceous-red, slowly fading
to dull ochraceous with red splashes, margin even; context thick, yellow,
drying dingy pale straw color.
Tubes yellow, up to 1.5 cm deep, slightly bluish bruised, depressed
at the stipe; pores small (1-2 per mm), yellow, bluish if injured.
Stipe 6-12 cm long, 1-2 cm thick, equal or nearly so, solid, yellow
within,-surface dark red like the pileus to apex, pruinose, not reticulate,
base coated with ochraceous mycelium (as dried).
Spores 14-17 X 4-5.5 u, smooth, in face view subfusoid, in profile
somewhat inequilateral, color in KOH pale ochraceous to brownish
ochraceous, in Melzer's dingy blue as revived, apex with a minute pore,
wall about 0.3 p thick.
Basidia 4-spored, clavate, 8-11 p wide at apex. Pleurocystidia scattered, 38-56 X 9-16 p, fusoid-ventricose, hyaline or yellow in KOH, neck
10-30, long, apex subacute, wall thin and smooth. Cheilocystidia yellow
in KOH, mostly basidiole-like or narrower. Caulocystidia very numerous,
basidiole-like to fusoid-ventricose, yellow in KOH, mostly 6-11 Ji wide
when fusoid, having scarcely any neck, thin-walled and lacking incrustations.
Cuticle of pileus a short trichodermium of hyphae 9-15 p wide
with end-cells cystidioid to clavate and 14-25 p wide, their walls showing a slime coating in KOH, content yellow in KOH and red in Melzer's,
secondary septa present in some cutting off a short, tapered apical cell,
the cells of the hyphae back from the 1-2 tip cells 6-12 p wide. Hyphae
of context with deep red content in Melzer's. Clamp connections apparently absent.
Habit, habitat, and distribution.-Known from the Waterloo
Recreation Area, Washtenaw County, type collected by Ruth Zehner
(349), August 13, 1968.
Observations.-This species was mistaken in the field for B. bicolor, which it resembles perfectly. Since the collector knew B. bicolor
well, including its tendency to stain blue, and since the cut surfaces of
the pilei and stipes of the basidiocarps of B. bicoloroides dried as if blue
staining had taken place, we have assumed a change to blue in the fresh
basidiocarps did take place even though no mention was made of it on
the label-the collection was simply identified as B. bicolor at the time
of collection. B. bicoloroides differs from the latter markedly in the
almost hymeniform pileus cuticle of broad cystidium-like cells, the deep