Consulted experts for ID as I an unfamiliar with most amanitas
It was found along the upper section of the East Trail descending towards Russian Gulch Creek; probably a five-minute walk from the north boundary trail connection. Redwood habitat but fairly dry currently. I've tried to guesstimate the coordinates here: 39.334089, -123.760694. The iphone coordinates place it too near the creek I think.
There were three growths present on the uphill-side of the trail. Only one was growing with the wooly chanterelle.
Substrate: mud at the bottom of a granite step, right in the middle of the trail. Same specimens as https://www.inaturalist.org/observations/118996208
This name has been updated. I IDed it using the old name Neohygrophorus angelesianus in "The Essential Guide to Rocky Mountain Mushrooms by Habitat", esp the KOH test.