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

342

THE BOLETES OF MICHIGAN

it does not stain blue and has wider spores. The reddish color noted for
the context may possibly be a matter of aging, not autooxydation on
exposure to air.
184. Boletus eberwhitei Smith & Thiers, sp. nov.
Pileus circa 11 cm latus, convexus, siccus, aurantiobrunneus
demum subalutaceus. Contextus laete luteus, immutabilis. Tubuli circa 1
cm longi, lutei; pori 1-2 per mm, ferrugineo-rosei. Stipes circa 10 cm
longus, 2.5 cm crassus, sursum luteus et obscure reticulatus, deorsum
subluteus. Sporae 9-12 X 3.8-4.5 M. Specimen typicum in Herb. Univ.
Mich. conservatum est; prope Ann Arbor, September 25, 1965, legit
Florence Hoseney (Smith 72721).
Pileus about 11 cm broad, convex, the margin fertile but irregular;
surface dry and even or slightly uneven and with obscure areolate
mottling, dull orange-brown in color drying crust-brown; context pale
bright yellow, unchanging when cut or slowly becoming salmon-buff
(but not blue), FeSO4 bluish gray, KOH pinkish, Melzer's on tubes dark
blue.
Tubes up to 1 cm deep, adnate to slightly depressed, near ocheryellow and unchanging when cut; pores 1-2 per mm, rusty rose near
stipe, paler toward the cap margin, unchanging when bruised, in drying
reddish stains show on sides of tubes in places.
Stipe 10 cm long, 2.5 cm thick, equal solid, cortex lemon-yellow,
pith dingy yellow, base buff to grayish, surface yellow above, ochraceous at ground line, apical region reticulated by a fine inconspicuous
reticulum.
Spores 9-12 X 3.8-4.5 u, smooth, narrowly elliptic to oblong in
face view, suboblong to obscurely inequilateral in profile, amyloid fresh,
weakly so as revived; greenish ochraceous in KOH, finally weakly tan in
Melzer's, wall about 0.2 u thick, no apical pore evident.
Basidia 4-spored, 7-9 J broad. Pleurocystidia scattered, 28-40 X
7-12 t, clavate-rostrate with the neck flexuous and projecting only
slightly beyond the hymenium, context hyaline in KOH or yellowish but
soon fading. Caulocystidia clavate, mucronate, or fusoid-ventricose,
20-40 X 9-15 i or some 40-60 X 15-22,, and subelliptic to clavate,
thin-walled and not reviving readily.
Cuticle of pileus of interwoven hyphae 3-6, wide with bright
yellow content in KOH and pigment leaching into the mount, hyphae
tubular or nearly so, end-cells tubular or nearly so and not organized
into any kind of layer, in Melzer's the cuticular hyphae dull ochraceous
and context hyphae bright red. No clamp connections observed.