since it not found under quercus litter, cap doesn't have any hint of greenish yellow, even though i am not seeing a clear shot of the gill, I will venture to say that this is volvopluteus gloiocephalus, and to further confirm it you do a spore print and hopefully its a salmon pink, and not white
sea-kangaroo
2016-01-09
2016-01-09 17:04:34
United States of America, California, Mountain View Baylands, California, USA