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The Whitewall Tire Polypore, aka ???


Gillian

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Out in the forest and found a downed tree, cottonwood or ash, with ~20 of these bright white, biconvex polypores on them, all around the same size, some clustered, some singles.

I tried to cut one off (you can see my fingerprints bruising the underside on the top one) with a sharp knife and it was so densely rubbery I could have sworn I was trying to cut through a tire!

It squeaked and squeaked as I tried to cut through it. Not woody, not fleshy, just hard rubber.

The underside darkened to a grey overnight, and three days later still no spore print either on white or black paper. The light in my shed makes the last 3 pics look tan but it's still quite white. Deep pores.

Who is old enough to remember whitewalls?

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