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

TYLOPIL US

95

Basidia 2- and 4-spored, 24-36 X 8-12 p, hyaline in KOH, yellowish in Melzer's. Pleurocystidia scattered, 35-50 X 6-11, narrowly
fusoid-ventricose with gradually tapered neck and subacute apex, thinwalled, hyaline in KOH and Melzer's. Cheilocystidia mostly narrowly
clavate, basidioid, 40-60 X 9-12 /, hyaline, thin-walled.
Tube trama gelatinous and divergent, hyphae nonamyloid. Pileus
cuticle a trichodermium of hyphae 5-10uI in diameter, the upper part
with short cells but terminal cells often more or less cystidioid and
longer (40-60 X 9-15,t), hyaline in KOH or yellowish, nonamyloid.
Surface of stipe a layer of interwoven to suberect hyphal tips some of
which are contorted to cystidioid. Clamp connections absent.
Habit, habitat, and distribution.-Solitary to scattered, usually
under aspen or hemlock in Michigan, fruiting most abundantly early in
the summer, late June to early July locally.
Observations.-There is considerable variation in the color of the
fresh spore deposit, but this stabilizes with loss of moisture. The species
is amply distinct by its slender stature and pinkish cinnamon colors
along with the spores, some of which show the markings as described,
although in some pilei we have found it difficult to find ornamented
spores. It is best to mount the spores in Melzer's to see the ornamentation.
Material examined.-Barry: Smith 73126. Cheboygan: Bartelli
160; Charlton G-214; Lange 1579; Smith 25771, 37335, 37555, 71927;
Thiers 742, 1210, 3455, 3788. Emmet: Kauffman 1905; Smith 41904,
62970; Thiers 3530, 3535, 3745. Luce: Smith 37408, 39059, 39287,
39493, 42301, 72378; Thiers 3858, 3863. Marquette: Smith 72481.
Montmorency: Smith 74739. Ontonagon: Peters 1147.
Section PORPHYRELLUS
Stirps PSEUDOSCABER
The species grouped here are all obviously closely related. They
are united by: (1) the overall dark somber colors, (2) they stain waxed
paper blue, (3) the spore deposit is in the chocolate-brown series, typically the hymenophore is white at first or merely pallid, and (4) the
pileus is dry and unpolished to velvety. The type species is at once
distinguished by the large spores and the context changing to blue readily when cut along with dark brown pores. T. sordidus is distinguished
by its strongly inflated large cheilocystidia and a small percentage of
very wide thick-walled spores in mounts from the hymenophore (see
Smith & Thiers 1968). T. cyaneotinctus has a dull yellow stage in the
development and maturation of the hymenophore as well as small