These look like Piptoporus betulinus — white with brownish flaky stuff on top, very small pores, a rounded white raised (lowered?) rim around the pore surface, and erupting from birch with a stubby stipe forcing the bark aside.
Except that they’re freaking huge, up to 10cm wide, not the 2-3 more typical in my experience of P. betulinus.
Found on a fallen Betula papyrifera branch in Zone 48.
Piptoporus betulinus (Bull.) P. Karst. on MyCoPortal
Piptoporus betulinus on MycoBank
Public Description (Default) [Edit]
Draft For 2008/2009 Eol University Species Pages Initiative By Jered (Private)
Draft For Wild Mushrooms Of The Northeastern United States By Erlon (Private)
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Created: 2011-09-08 20:51:23 PDT (-0700)
Last modified: 2011-09-08 20:54:56 PDT (-0700)
Viewed: 9 times, last viewed: 2017-06-09 19:07:59 PDT (-0700)