Thick, woody polypore on river birch. 8 cm across.

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By: Penny Firth (pfirth)
2017-01-21 06:54:20 CST (-0600)

Do you think the white spots on the pore surface is a parasitic fungus?
Thanks, Penny

By: GP Van Eron (reishiTea)
2017-01-20 20:54:28 CST (-0600)

striking concentric zones on this