Looks more like this to me - but if you touched the white surface and it easily turned brown, that would make it Ganoderma - usually they are rusty brown on top in my experience.
marymchurchill
2018-06-00
Sat Jun 16 2018 15:46:54 GMT-0800 (AKDT)
United States of America, Alaska, Tongass National Forest, Juneau, AK, US