Paxillus involutus, also know as Poison Pax, has a strongly inrolled, yellow- to red-brown cap, with a downy margin and slightly depressed center and ochre-brown gills. It grows solitary or in trooping groups on soil in leaf woods.
initially convex then more funnel-shaped with a depressed centre and rolled rim, may be reddish-, yellowish- or olive-brown in colour. The surface is initially downy and later smooth, becoming sticky when wet. Gills
brownish yellow, narrow, decurrent and forked, and can be peeled easily from the flesh. They further down toward the stem become more irregular and anastomose. Stem
is similarly colored as the cap, however bruising darker brown. It is smooth, equal or tapering downwards. The mushroom has not ring.
Paxillus filamentous has a less incurved margin, yellow flesh, and occurs under alder.
on the First Nature Web site.
on the MushroomExpert.Com Web site.