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

Smith ~ Hesler

251

132. Pholiota humii sp. nov.
Illustrations: Text figs. 281-284.
Pileus 1-3 cm latus convexus, viscidus, glaber, vinaceo-brunneus.
Contextus pallidus, graveolens. Lamellae adnatae demum subdecurrentes.
pallidae demum luteae, confertae, subangustae. Stipes 2.5-4 cm longus,
(1.5)2-5 mm crassus, aequalis deorsum vinaceo-brunneus, sursum pallidlis
demum luteus. Sporae 5.5-7 X 4-4.5(5) t,. Pleurocystidia 45-75 X 9-17 p,,
fusoide ventricosa, obtusa, crassotunicata. Specimen typicum in Herb.
Univ. Mich. conservatum est; legit prope "Heaven's Gate, Seven Devils
Mts.," Idaho, 5 Juli, 1958, Smith 58633.
Pileus 1-3 cm broad, convex, expanding, viscid, when young dark
vinaceous brown ("natal-brown" to "Verona-brown"), later the disc
"army-brown," finally reddish tawny, the margin paler brown, glabrous,
even. Context pallid; odor fragrant (like green corn), taste slight; FeSO4
-bright green.
Lamellae adnate to subdecurrent, at first whitish, then brown, close,
medium narrow.
Stipe 2.5-4 cm long, (1.5) 2-5 mm thick, with scattered fibrils, pallid
or pale tawny, base dull vinaceous brown ("army-brown"), equal. Veil
arachnoid, yellowish.
Spores 5.5-7 x 4-4.5 (5) p, in face view ovate to elliptic, in profile
somewhat bean-shaped to subelliptic, wall relatively thin (+ 0.2 pJ) and
apical pore a very minute spot (under 1.4 NA ob.). In KOH dingy
ochraceous tawny, in Melzer's reagent paler but more cinnamon.
Basidia 19-24 x 6-7.5 pi, 4-spored, yellow in KOH or in Melzer's
reagent, narrowly clavate. Pleurocystidia 45-75 x 9-17 tL, abundant,
fusoid-ventricose with obtuse apex, wall up to 3 /t thick in ventricose
part, thin-walled at obtuse apex; content ochre-yellow when first revived
in KOH, slowly fading, homogeneous; wall in neck somewhat flexuous;
surface smooth. Cheilocystidia 30-45 x 9-14 Ft, broadly subfusoid, subelliptic-pedicellate, or fusoid-ventricose with obtuse apices, both thinwalled and thick-walled cells intermingled. Caulocystidia abundant,
broadly fusoid, 35-70 x 10-20 Fu, thin-walled or wall thickened (0.4-1 ft),
hyaline, content homogeneous.
Gill trama with short- to long-celled hyphae more or less in parallel
arrangement, the cells becoming inflated in age, 6-12 (20) JL broad; walls
thin, hyaline to yellowish in KOH, smooth; subhymenium of narrow
(-3 Fu) gelatinous interwoven smooth-walled hyphae, hyaline in KOH,
near gill edge the zone at times so broad as to nearly obscure the
floccose central strand. Pileus cutis a gelatinous layer of appressed-interwoven narrow (2-5 F) yellowish hyphae, those near the hypodermium
conspicuously incrusted (not so at upper edge of layer); hypodermium
of floccose hyphae 5-12 Ft diam. with coarse dark rusty brown pigment
incrustations. Context hyphae yellowish to hyaline in KOH, cells inflated