Even though this mushroom is supposed to be quite common, I'd never seen it before, so when I spotted it tucked away in the woods I felt as though I'd found treasure. Tricholomopsis rutilans is it's official name, but it's commonly called Plums and Custard because of the creamy yellow gills and the plum colored scales on the cap and stem. This one had no scales on the stem, probably because it was an older mushroom. I was pleasantly surprised to see the white flesh of the stem and cap turn bright yellow around the edges when I cut it. I've found no mention of that in online descriptions.