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Paxillus involutus   (Poison Pax)
North America, Europe
Cap 5-12 cm diameter, stem 3-7 cm tall * 0.8-1.2 cm diameter

Paxillus involutus, also know as Poison Pax, is a medium to large agaric with a strongly inrolled, yellow- to red-brown cap and crowded, decurrent gills extended down on the firm stem. The mushroom grows solitary or in trooping groups on soil in leaf woods and is moderately poisonous.

Cap 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 coloured as the cap, however bruising darker brown. It is smooth, equal or tapering downwards. The mushroom has no ring.

Similar species Paxillus filamentous has a less incurved margin, yellow flesh, and occurs under alder.

Paxillus involutus on the First Nature Web site.
Paxillus involutus on the MushroomExpert.Com Web site.

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