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Ischnoderma resinosum (Schrad.) P. Karst.


Late fall polypore, resinous polypore

ParentsUnknownGenus is not in the current taxonomy

About plant names...

This polypore mushroom is a North American native, found throughout much of the continent.

Identification: These fungi emerge from dead hardwoods or conifers, looking like gnarled, mummified ears. The “ears” (caps) are 1¾-12" (5-30 cm) wide and ⅜-1" (1-3 cm) thick. They sometimes emit droplets of water, which ball up on top of the resinous surface like beads of mercury. A tan to reddish brown resin often encrusts these fungi, whose interiors are white. There is no stalk.

Edibility: Said to be edible when young and wet with exuded water, but these become corklike as they age.[1]

Medical: These mushrooms contain compounds that are being investigated for possible use in inhibiting tumor growth in cancers.


Arora, David, Mushrooms Demystified, Ten Speed Press, 1986, p. 572

Online References:

Ischnoderma resinosum on Michael Kuo's MushroomExpert.com

Ischnoderma resinosum on RogersMushrooms.com

Ischnoderma resinosum by Gary Emberger at Messiah College

Ischnoderma resinosum at Wisconsin Mushrooms

Ischnoderma resinosum on AmericanMushrooms.com

Ischnoderma resinosum at North Carolina State University's Mycological Herbarium

Ischnoderma resinosum on MycoBank

1See David Arora's book Mushrooms Demystified.

Ischnoderma resinosum description by Thomas H. Kent, last updated 25 May 2020.

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Ischnoderma resinosum (late fall polypore, resinous polypore)

≈ 3½ × 5" (8.8 × 13 cm) ID is uncertain

Ischnoderma resinosum (late fall polypore, resinous polypore)

8/27/2007 · Shore Acres State Park, Cape Arago, Ore­gon
≈ 5 × 3½" (13 × 8.8 cm) ID is uncertain