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

400

THE BOLETES OF MICHIGAN

to vesiculose cells 8-18 g wide with pedicels 2-6 i wide. Hyphae of
cuticle proper gelatinized both in KOH and Melzer's. The hyphae of the
context and cuticle lacking distinctive content in Melzer's. Clamp connections none.
Notes. We are not inclined to accept that B. fistulosus is the same
as B. inflexus (see Singer, 1947). The most obvious differences are:
Sections of B. fistulosus when mounted in KOH exhibit so much globular material that anatomical detail is difficult to see. We suspect this
species of having a latex. Second, the pseudocystidia have so little content as to be difficult to locate. Finally, there appears to be a cellular
epicufis in B. fistulosus, whereas in B. inflexus such a layer could not be
demonstrated though in both the components are reasonably similar
anatomically. To us these are significant enough to suggest that further
critical studies based on fresh material should be made. Both of these
species are relatively unrelated to Pulveroboletus in the sense of the type
of that genus.
Boletus inflexus Peck, Torrey Club Bull. 22:207. 1895
Illus. Figs. 124-25.
"Pileus convex, glabrous, viscid, yellow, often red or reddish on
the disk, the margin thin, inflexed, concealing the marginal tubes, flesh
whitish, not changing color where wounded; tubes rather long, adnate,
yellowish, becoming dingy-yellow with age, the mouths small, dotted
with reddish glandules; stem rather slender, exannulate, solid, viscid,
dotted with livid-yellow glandules; spores yellowish,.0004 to.0005 in.
long,.00016 to.0002 broad.
"Pileus about 1 in. broad, stem about 2 in. long, 24 lines thick.
"Open woods. Trexlertown, September, Herbst."
Type study. Spores 12-15 (16) X 4-5 u, smooth, lacking an apical
pore, color in KOH bright yellow fading considerably on standing, in
Melzer's pale tawny, shape in face view suboblong to narrowly elliptic,
in profile obscurely to somewhat inequilateral, wall less than 0.2 p thick;
no amyloid reactions other than weakly dextrinoid evident.
Basidia 4-spored, 5-7 # wide, yellowish or hyaline in KOH or
Melzer's. Pleurocystidia in the form of pseudocystidia scattered, 36-65 X
5-10 i, narrowly clavate, in KOH with amorphous ochraceous to orange
content which in Melzer's is often dextrinoid.
Pileus cutis a thick layer of tangled narrow (2-7, wide) hyphae
which gelatinize in Melzer's but not appreciably in KOH, the hyphae
tubular and at the surface the hyphal ends clavate to globose and as first
revived in KOH with much mucilaginous material adhering and obscuring