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

BOLETUS

325

Basidia 4-spored, 24-27 X 8-9,, clavate, yellow in KOH or
Melzer's. Pleurocystidia 33-45 X 8-12 g, narrowly ventricose to fusoid
with acute apex, walls sometimes flexuous, hyaline to yellowish in KOH
or Melzer's, content not distinctive, thin-walled, smooth. Cheilocystidia
similar to pleurocystidia but smaller and varying more toward clavate
and averaging broader.
Tube trama divergent and gelatinous, the hyphae hyaline, thinwalled and smooth with some dextrinoid debris along the hymenium.
Pileus cuticle matted down into a layer of interwoven hyphae, hyphae
3-6 (8)# wide, the hyphal cells tubular, the end-cells tubular and obtuse, at times with a slight amount of hyaline incrusting material or wall
roughened by irregular adhesions, hyaline in KOH, but most hyphae
smooth, in Melzer's smooth and the cell content ochraceous to orange
brownish, amyloid debris present in the layer as well as some that is
dextrinoid. Hyphae of context thin-walled and smooth, as seen in
Melzer's having dull orange to ochraceous content. Laticiferous elements
present, 4-8 p. wide and content ochraceous in either KOH or Melzer's.
Clamp connections absent.
Habit, habitat, and distribution.-Solitary to scattered in open
hardwoods and mixed forests, often near woodland pools or moist depressions in the woods, late summer or early fall, rare but most frequent
in the Lower Peninsula.
Observations.-This is one of our most beautiful species. It is most
closely related to B. regius. A critical comparison of these remains to be
made (see Thiers, 1967).
In our Michigan collections the rose-pink is still evident, but in the
type it has disappeared. The specimens described above agree with the
type in having identical very narrow spores, a pileus cutis of appressed
hyphae 3-7.i wide, and some amyloid and some dextrinoid debris in the
layer between the hyphae, in lacking cystidioid or otherwise distinctly
differentiated end-cells on the cutis hyphae, in staining blue when injured, and in having rose tints lower down on the stipe.
The specimen studied is a Frost specimen sent to Peck and is in
the Peck collections at Albany, New York, and is here designated as
lectotype since Frost did not designate a specimen as the type. The
account of its microscopic characters is that given in our description.
175. Boletus pseudopeckii Smith & Thiers, sp. nov.
Pileus 4-10 cm latus, convexus, demum subplanus, siccus, impolitus, roseus vel lateritius demum sordide luteobrunneus. Contextus