Agaricus moronii

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Ecology: Saprobic; growing gregariously under spruces and firs; late summer; probably distributed throughout the western North American mountains. The illustrated and described collections are from Colorado.

Cap: 6-10 cm; convex, becoming broadly convex or nearly flat; dry; bald; whitish, becoming streaked with brassy orangish, or dull yellowish overall with age; bruising bright yellow when rubbed, especially near the margin.

Gills: Free from the stem; nearly crowded; short-gills frequent; whitish when very young, becoming dark brown at maturity; when in the button stage covered with a whitish partial veil.

Stem: 7-10 cm long; 2-2.5 cm thick; more or less equal above a somewhat abruptly terminating, squarish base; more or less bald; with a thick, whitish, skirtlike ring that may stain yellow; whitish, bruising yellow, especially at the base.

Flesh: White; changing to yellow in the stem base when sliced.

Odor and Taste: Odor strong, reminiscent of almonds, becoming foul with age; taste similar.

Dried Specimens: Cap and stem dull orangish yellow.

Chemical Reactions: KOH yellow on cap surface.

Spore Print: Dark brown.

Microscopic Features: Spores: 6-8 x 4-5 m; ellipsoid; smooth; thick-walled; brown in KOH; brown in Melzer's. Basidia 4-sterigmate. Cheilocystidia 15-25 x 7-9 m; clavate to subclavate; catenulate; smooth; thin-walled; hyaline in KOH. Pleurocystidia not found. Pileipellis a cutis.

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