Peziza proteana var. sparassoides (Boud.) Seaver
The only reference I found in Mushroom Observer.http://mushroomobserver.org/name/show_name/16465 C.Schwartz was kind enough to point me in the right direction on this as I originally thought it might be a frost bitten Cauliflower mushroom of the genus Sparassis. The fruiting body was extremely dense/heavy. I have dried down some slices to keep for sequencing.
Verbatim Date: Sun Apr 24 2016 13:19:02 GMT-0700 (PDT)
United States, California, Trinity National Forest, Platina, CA, US
Rights Holder: © held by the observer (listed as 'Collector') at iNaturalist.org, with some rights reserved (CC BY-SA)
Record Id: 72ccdcdc-d7a3-4488-a0c1-2f282545f617