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Omphalotus illudens   (Eastern jack-o'lantern)
North America and Europe
Cap 8-12 cm diameter, stem 4-14 cm tall * 1-2.5 cm thick

Omphalotus illudens, commonly known as the eastern jack-o'lantern mushroom, is a large, orange mushroom, with strongly decurrent gills, that is often found in clumps on decaying stumps, buried roots or at the base of hardwood trees.

Cap convex to flat, often with a low, central, pointed knob and an incurved margin which is soon becoming depressed on disc centre and inner limb. The surface is smooth to fibrillose and bright orange to orange-yellow. The flesh is firm, thin and yellow. Gills strongly decurrent, narrow to moderately broad, close and orange-yellow. Stem cylindric or tapered to base. The surface is dry, smooth to minutely downy or somewhat scaly in age. The mushroom has no ring.

Similar species Omphalotus olearius which has a less brighter orange cap.

Omphalotus illudens on the First Nature Web site.
Omphalotus illudens on Wikipedia.

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