The North American species of Pholiota, by Alexander H. Smith and L. R. Hesler.

Smith ~ Hesler

89

forerunner of a spore apex resembling that of Boletus truncatus. No
relationship, of course, is implied between the two just mentioned. The
pleurocystidia are very inconspicuous.
The same spore feature is found in P. palud(osella, but there it is
not so distinct or present on as many spores.
Key
1. Gills very wide; gelatinous subhymenium very well developed; pileus
yellowish white........................................ P. kalmicola
1. Gills only moderately broad; subhymenium a poorly defined layer;
pileus pale alutaceous on disc, margin olivaceous....... P. serotina
34. Pholiota serotina sp. nov.
Illustrations: Text figs. 70-71.
Pileus 2-4 cm latus, hemisphericus vel late convexus, viscidus, subsquzamulosus, pallide alutaceus. Lamellae adnatae, demum sinztatae, confertac, latae, albidae demum ligno-brunneae. Stipes 4-5 cm longus, gracilis, fibrillosus, deorsulm brunnescens, sursutm pallidus. Vellum fibrillositm.
Sporae 7.5-9(11.5) x 4-5 (5.5) tu. Pleurocystidia iulconspicula, fusoide
ventricosa, 18-24 x 6-9 /u. Specimen typicum in Herb. Univ. of Mich.
conservatum est; legit prope Ann Arbor, 12 Nov. 1911, C. H. Kauffman.
Pileus 2-4 cm broad, at first subhemispheric, then broadly convex,
margin decurved, pinkish buff, the center minutely dotted by innate
scales, later taking on pale olive color towards margin, slightly incarnate
tinted on the disc from the dotlike scales, with a distinct viscid pellicle,
even on margin. Context concolor, thin.
Lamellae adnate, then sinuate-uncinate, or with faint decurrent lines,
medium broad (4-5 mm), close, of equal width, white at first, covered
when young by a cortinate veil, at length gray-brown ("wood brown")
and dusted by ferruginous spores, edges entire.
Stipe 4-5 cm long, 2-4 mm thick, slender, subequal and tapered
slightly downward, at first covered with fibrillose subsilky covering,
brunnescent, tubular and white within, becoming brown later. Veil
cortinate, evanescent.
Spores 7.5-9(11.5) x 4-5(5.5) /u, smooth, apical pore distinct and
in most spores surrounded by a wall thickening evident in an opticalsection view of the spore; shape elliptic to oblong in face view or varying
to slightly irregular in outline, in profile view obscurely inequilateral to
subelliptic, wall up to about 0.5 L thick in KOH mounts, tawny in KOH
and not much change in Melzer's reagent.
Basidia 18-24 x 6-8.5 i/, 2-spored and 4-spored, obese, yellowish in
KOH, orange-yellowish in Melzer's reagent. Pleurocystidia 18-24 x 6-9,J, resembling basidioles or rarely with a neck 4-5 /u diam., very incon