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

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THE BOLETES OF MICHIGAN

boat-shaped, in profile narrowly inequilateral; pallid-ochraceous in KOH
and in Melzer's hardly changing, smooth, no apical pore apparent.
Basidia 4-spored, 23-32 X 8-10 j, yellowish to hyaline in KOH,
nonamyloid or some areas of hymenium dingy bluish at first but soon
fading (reaction not clearly localized). Pleurocystidia scattered, 24-38 X
8-12 j, fusoid-ventricose, neck often curved, thin-walled, hyaline, nonamyloid, apex subacute to acute. Cheilocystidia abundant, with gelatinous pedicels, obfusoid above and in a dense palisade, often with
elongated neck, content red when fresh.
Tube trama gelatinous and of divergent hyphae, nonamyloid
though sections may appear dingy bluish at first when mounted. Cuticle
of pileus a thick gelatinous tangled to matted-down layer of hyphae
3-6 i wide, hyphae hyaline to yellowish in KOH. Context hyphae floccose-interwoven, hyaline in KOH. Nonamyloid in all parts under the
microscope but a fleeting-amyloid reaction present on the tissue revived
in Melzer's. Clamp connections absent.
Habit, habitat, and distribution.-Scattered to gregarious in open
oak woods, common in July and August in southern Michigan during
wet.seasons.
Observations.-This species is supposed to be edible, but we advise
against trying it in spite of the ease with which it can be identified. It is
in a dangerous group. One of the best field characters is the fact that
the hymenial surface, especially the pore surface, exudes droplets of
yellowish liquid when rapidly developing. The coarsely reticulate stipe,
dark apple-red viscid pileus and weak color change to blue are additional
field characters.
Material examined.-Barry: Mazzer 4229, 4325; Smith 73168,
73206, 73209. Livingston: Homola 945, 1953. Oakland: Smith 6735.
Washtenaw: Baxter 1920; Homola 1628; Hoseney 560; Smith 9615,
18436, 62625, 62848, 62898, 64154, 72519; Thiers 4507, 4556, 4596.
186. Boletus rubroflammeus, sp. nov.
Illus. P1. 138.
Pileus 6-12 cm latus, convexus, siccus, adpresse fibrillosus demum
glaber, vinaceo-ruber. Contextus luteus tactu caeruleus. Tubuli 1-2 cm
longi, lutei tactu violacei; pori roseoflammii, stipe 6-8 cm longus, 1-3
cm crassus, roseo-reticulatus; sporae 10-14 X 4-5,. Specimen typicum
in Herb. Univ. Mich. conservatum est; prope Ann Arbor, legit Smith
15352.