Collection location: Mountain View, Santa Clara Co., California, USA [Click for map]
Appears to be in the Gymnopilus genus due to the cortina, warty spores, and red fibrillose cap with fibers.
ID of Gymnopilus luteofolius looks good.
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Hesler mentions in his monograph on North American Species of Gymnopilus that Gymnopilus viridans will become green-spotted where handled, but your specimens look like G. luteofolius. Stamets talks about G. luteofolius becoming green in Psilocybin Mushrooms of the World, MykoWeb mentions it and the PNKC key for Gymnopilus seems to key right to it!
More photos of G. luteofolius
I should also mention that both the cap and stem bruise a blue-green color where damaged.
The mushroom has a very mild flavor, definitely not bitter.
Any help ID’ing to species would be appreciated.