Yellow American Blusher

The cap of is 3.5–10.5 centimetres (1+1⁄2–4 inches) wide, yellow to brassy yellow to lemon yellow, sometimes dark orange brown, sometimes with pigment entirely washed out by rain becoming pallid, sometimes very deep wine red in its entirety due to bruising during development, subovoid to hemispheric to plano-convex to convex, depressed in the center, slightly tacky to dull to subviscid to subvelvety, with an incurved or downcurved, rimose, and nonstriate margin (may become slightly striate with age). It is adorned with conspicuous, woolly to felty, yellow warts; bald underneath the warts; the margin not lined, or only faintly lined at maturity. The volva is present as yellow to orange to bright orange-yellow flocculent to confluent warts, friable, sparsely and irregularly distributed, easily removable, pulverulent, splotchy brown around the center, yellow at the edge. The flesh is 3–7 millimetres (1⁄8–1⁄4 in) thick over the stem, thinning evenly to the margin, white or yellowish, bright yellow just under the cap skin. The gills are free to very narrowly adnate, subcrowded to crowded, creamy ivory to cream to off-white, 3–8 mm broad, with a white pulverulent edge and also a small decurrent tooth. The short gills are truncate to subtruncate to subattenuate to attenuate to attenuate in steps, unevenly distributed, of diverse lengths, and plentiful. …

A. flavorubens was originally described from the U.S. state of Ohio, and is also known from forests associated with beech (Fagus grandifolia), oak (Quercus), pine (Pinus), birch (Betula), and Canadian hemlock (Tsuga canadensis) from south-eastern Canada to the state of Alabama in eastern North America, central Mexico, and south-eastern Arizona. A. flavorubens is one of the few taxa in North America that are known to have a western population disjunct from an eastern primary area of distribution.