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

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The North American Species of Pholiota

4. Gills broad at maturity.................. Stirps Obscura
4. Gills narrow........................................ Stirps Vernalis
Stirps Mutabilis
In this group are placed first of all species with a distinctly scaly stipe
and glabrous pileus as well as two additional species with stipes 4-12 mm
thick in which the pileus is viscid or at least has a thin gelatinous pellicle
but in which the veil is not developed enough to produce scales on the
stipe. P. veris is often riddled by insect larvae by the time the spores are
formed.
Key
1. Pileus dull cinnamon fading to yellowish; stipe distinctly scaly below
annulus at tim e veil breaks.................................................... P. m utabilis
1. Not with above combination of features.......................................... 2
2. Chrysocystidia present in hymenium..................................... 3
2. Chrysocystidia absent........................................ 4
3. Veil yellow; yellow pseudocystidia present in the hymenium........................................................................................................... P. c a e s p ito s a
3. Veil remnants on stipe yellow-brown; pseudocystidia absent.......................................................................................................... P. tennessensis
4. Hypodermial zone of pileus with cell walls hyaline in KOH and
about 1,L or slightly more thick......................... P. albo-olivascens
4. Hypodermial zone of brown hyphae with thin walls as seen in
K O H........................................................................................... P. v e ris
36. Pholiota mutabilis (Fr.) Kummer, Der Fiihrer in die Pilzkunde
). 83. 1871.
Agaricus mutabilis Schaeff. ex Fries, Syst. Myc. 1: 245. 1821.
Pholiota mutabilis Quelet, Champ. Jura et Vosges, p. 94. 1872.
Dryophila mutabilis Quelet, Enchir. Fung. p. 69. 1886.
Kuchneromyces mutabilis (Fr.) Singer c Smith, Mycologia 38: 505. 1938.
Illustrations: Text figs. 123-124; pls. 12-14.
Pileus 1.5-6 cm broad, obtuse when young (rarely papillate), becoming campanulate or broadly conic while the margin is still strongly
incurved, expanding to convex or plane or retaining a low broad abrupt
umbo, the margin often remaining decurved, hygrophanous, reddish
cinnamon to dull cinnamon or clay-color ("Verona brown" to "claycolor" to "ochraceous-tawny" or "sayal-brown" at maturity), fading to
pale alutaceous (near "pinkish-buff" or yellower and near "ochraceousbuff" on disc), fading on the disc first or in a zone between disc and
margin, surface glabrous or with inconspicuous white fibrils from the