I could be incorrect, I found my first of these a few days ago. The characteristics I'm seeing are the swollen base with the curved scales, the lack of a prominent umbo, the grey coloring, and the spiky rather than flaky cap. I'll definitely retract my ID if you disagree though.
hapaxlegomenon
2018-09-00
Fri Sep 21 2018 12:40:53 GMT-0400 (EDT)
United States of America, Tennessee, Great Smoky Mountains National Park, Gatlinburg, TN, US