Parasitized on the same branch by Tremella foliaceae, I narrowed it down to Stereum spp. No red latex when cut. Doesn't seem dark enough for S. complicatum.

Seems on the pale side, but some online searches show specimens as pale as mine. Doesn't make sense for the other yellowing latex Lactarius spp. Use Michael Kuo's key on www.mushroomexpert.com.

One of two mushrooms seen over a period of about a month. Neither survived the ravaging of a two-year old, although they were rather slow growing.

Found growing on underside of decaying log in abandoned wood pile. Bottommost log, degrading into humus. Very small mushrooms, perhaps 1.5 mm for the largest cups.