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

Smith ~ Hesler

211

observer. Since these cells are generally present through the P. adiposa
group in varying numbers even on basidiocarps in a single collection we
are inclined not to give any taxonomic emphasis to their relative abundance in our treatment of this group.
MATERIAL EXAMINED: COLORADO: Bartholomew (type). NEW
MEXICO: Barrows 791. UTAH: McKnight F-144. WYOMING: Overholts.
107. Pholiota aurivella (Fr.) Kummer, Der Fiihrer in die Pilzkunde,
p. 83. 1871.
Agaricus aurivellus Fries, Syst. Myc. 1: 242. 1821.
Hypodendrulm aurivellhm (Fr.) Overholts, North Amer. Fl. 10: 279.
1932.
Illustrations: Text figs. 222-224; pls. 49-50.
Pileus 4-16 cm broad, campanulate to convex, often broadly umbonate, when young more or less uniformly ochraceous orange to tawny,
at maturity more uniformly tawny, at first covered with large appressed
spot-like scales which may disappear and when wet may become more or
less gelatinous, cuticle viscid or gelatinous. Context yellow, firm.
Lamellae adnate, sinuate-adnate, or emarginate, pale yellowish, becoming ferruginous brown, close.
Stipe 5-8 cm long, 5-15 mm thick, yellowish or yellowish brown,
central or eccentric, floccose above the annulus, fibrillose below and increasingly scaly downward, the scales fibrillose and recurved, dry, equal,
solid.
Spores 7-9.5 (11) x 4.5-6 /u, smooth, apical pore distinct but apex
not truly truncate; in face view broadly elliptic, in profile broadly oblong
to obscurely bean-shaped; in KOH dingy cinnamon-color, in Melzer's
reagent darker reddish-tawny; wall about 0.25 / thick.
Basidia 24-28 (30) x 4.5-6 /i, 4-spored, hyaline to yellowish in KOH
and Melzer's reagent, narrowly clavate, some with hyaline refractive
amorphous particles, some with rusty-brown content in KOH (clearing
somewhat on standing) and some hyaline and homogeneous. Pleurocystidia 30-45 x 4-7 uL, mostly fusoid or branched once or twice near
apex (rarely appearing as having 3-4 coarse sterigmata, 3-4 JL at base
(but no spores ever seen attached); content hyaline to partially filled
with solidified colloidal material or with refractive particles cark brown
in Melzer's (but not with a characteristic refractive inclusion as in chrysocystidia). Cheilocystidia 26-35 x 5-10,/, subfusoid with obtuse apex
to fusoid-ventricose and obtuse, or versiform, wall at times thick enough
to show as a double line. Caulocystidia none.
Gill trama of floccose subparallel hyphae of elongate cells 5-15 /t or
more diam., thin-walled, smooth, hyaline to yellowish in KOH and
Melzer's reagent; subhymenium of narrow hyaline gelatinous hyphae
curving from a central strand to base of hymenium-very indistinct at