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

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The North American Species of Pholiota

Gill trama of a central strand of floccose hyphae with inflated cells
8-12 (16) b. broad, subparallel; walls thin smooth and yellow to pale
tawny in KOH; subhymenium of gelatinous narrow hyaline hyphae somewhat interwoven. Pileus cutis a gelatinous layer of yellowish hyphae
with smooth to asperulate walls, hyphae 2.5-5 pi diam.; hypodermium in
KOH strongly ochraceous to pale rusty brown, hyphae smooth to asperulate, cells 5-12 pL diam. Context of greatly inflated hyphae with smooth
ochraceous walls, non-gelatinous. All hyphae inamyloid but with a distinctly reddish tone. Clamp connections present.
HABIT, HABITAT AND DISTRIBUTION: Subcespitose around elm and on
soil with chips etc. mixed in it, Nov. 5, 1960, near Sharon Hollow (Manchester), Michigan, Smith 63406 type, and 72896, 20896; also Bartelli
2334.
OBSERVATIONS: This is a white to pallid to yellow species with veil
material present on the cap in varying amounts. The marked change in
color from youth to old age is quite deceiving. For further comment see
var. robusta.
74a. Var. robusta var. nov.
Pileus 3-7 cm latus, convexus, rare subumbonatus, viscidus, subsquamulosus, pallidus, demum avellaneus, lutescens. Lamellae pallidae,
latae, subdistantes, subdecurrentes. Stipe 3-6 cm long, 4-8 mm crassus,
pallidus, deorsum fulvescens. Sporae 5.5-6.5(7.5) x 3.3-4 p.. Chrysopleurocystidia 25-38(46) X 6-11(13) p.. Specimen typicum in Herb. Univ.
Mich. conservatum est; legit prope Milford, Mich., 30 Sept. 1951, Smith
38863.
Illustrations: Text figs. 88-89.
Pileus 3-7 cm broad, broadly convex to plane or rarely with a slight
umbo, surface viscid but soon dry, typically with minute slightly darker
spotlike squamules around and over disc, pallid when young becoming
avellaneous (grayish) and finally near snuff brown (dull yellow-brown),
yellow tones dominant in dried material. Context pallid, thin, finally
yellowish, odor and taste mild.
Lamellae pallid young, becoming near buckthorn brown and drying
more ochraceous, more or less decurrent, broad, more or less subdistant,
edges slightly fimbriate.
Stipe 3-6 cm long, 4-8 mm at apex, typically narrowed downward,
pallid but soon dingy brown from base up though nearly evenly dingy
buff as dried, with scattered minute scales below the veil-line, silky above.
Spores 5.5-6.5 (7) x 3.3-3.8 (4) pL, smooth, apical pore present, small
but causing apex to appear obscurely truncate in many; shape in face
view oblong to narrowly elliptic, in profile slightly bean-shaped to ob