The North American Species of Pholiota

150. Pholiota subsaponacea sp. nov.

Illustrations: Text figs. 336-338; pl. 69b.

Pileus 1-3 cm latus, late convexus, demum planus vel subdepressus, glutinosus, glaber, subbadius. Contextus cartilagineus, brunneolus; odor nullus, sapor subsaponaceo-farinaceus, cum FeSO4 olivaceo. Lamellae albae demum cinnamomeae, confertae, latae, adnatae. Stipes 1.5-3 cm longus, 3-6 mm crassus, aequalis, cavus, deorsum demum fulvus, sursum albus et pruinosus. Vellum sordide pallide cinnamomeum. Sporae 6-7.5 x 3.5-4.2 µ. Pleurocystidia 54-70 x 9-14 µ fusoide ventricosa. Specimen typicum in Herb. Mich. conservatum est, legit prope Upper Priest Lake, Boundary Co., Idaho, 11 Oct. 1966. Smith 74095.

Pileus 1-3 cm broad, broadly convex with an inrolled margin, expanding to plane or slightly depressed, surface glutinous, glabrous, bay brown (pale to dark). Context pliant, watery brownish, odor none; taste very disagreeable (somewhat soapy farinaceous), with FeSO4 olivaceous.

Lamellae whitish becoming dull cinnamon, close to crowded, moderately broad, thin, adnate becoming adnexed; edges even, pallid.

Stipe 1.5-3 cm long, 3-6 mm thick, equal, hollow, soon rusty over the base (but not within), coated up to the apical veil zone with a dull cinnamon sheath which breaks up into patches, apex whitish and pruinose.

Spores 6-7.5 x 3.5-4.2 µ, minute pore present at apex; shape in face view elliptic to slightly ovate, some nearly oblong, in profile elliptic to obscurely inequilateral; dull cinnamon brown in both KOH and Melzer's sol.; wall about 0.25 µ thick.

Basidia 4-spored, 20-36 x 5-6 (7) µ, narrowly clavate, hyaline in KOH. Pleurocystidia abundant, 54-70 x 9-14 µ, fusoid-ventricose with long narrow pedicels, content hyaline to yellowish in KOH, coagulated content not distinctively colored, walls thin and hyaline. Cheilocystidia 26-38 x 8-12 µ, mostly fusoid-ventricose with obtuse apex, content colloidal but not distinctively colored in KOH or Melzer's, walls thin and hyaline. Caulocystidia 55-70 x 9-12 µ scattered, hyaline, thin-walled, smooth, apex obtuse to slightly rounded.

Gill trama, an area of hyaline thin walled narrow parallel hyphae with some oleiferous hyphae scattered through it; subhymenium a gelatinous layer of narrow hyphae 2-4 µ diam. Pileus cutis a thick layer of widely spaced narrow (2-3 µ) hyphae with yellow slightly incrusted walls as revived in KOH (possibly a trichodermium in very young material); area next to hypodermium of narrow non-gelatinous hyphae with rather coarse incrustations; hypodermium proper of closely packed orange-brown (in KOH) incrusted hyphae with some cells up to 12 µ or more in diam. Context yellow to hyaline in KOH, closely arranged and with thin smooth walls. Clamp connections present.

Habit, Habitat, and Distribution: Gregarious on burned areas, Upper Priest Lake region, Boundary County, Idaho. 11 Oct. 1966. Smith 74095, type.

Observations: The very disagreeable persistent taste along with the dull cinnamon veil distinguish it from P. fulvozonata, P. brunnescens, and P. highlandensis.