Found by Jordan Gates,
Dark rounded top,
Yellow to white stipe,
Parasitizing truffle,
Growing trailside near bay laurel and redwood
Spores often truncate.
(24.8) 27.5 - 34.2 (37.4) × (11.5) 12.1 - 13.3 (13.5) µm
Q = (2) 2.1 - 2.7 (3) ; N = 15
Me = 30.9 × 12.8 µm ; Qe = 2.4
With large guttles at the poles averaging 5um in width. Smaller guttules present.
Growing in a humid (95%) terrarium with mixed hardwood leaves, bark, splinters, and other forest litter collected from nearby forests probably 9 weeks ago. Seems to be growing out of a very rotten chunk of wood overgrown with moss and liverwort. Primary specimen is 2cm tall, 2-3mm wide cap. Light colored gills. In photos 1 and 2 you can see a little baby popping up on its left.
Stipe seems noticeably scaly, this leads me to thinking G. paludosa may be the best match that the algorithm offered but these little brown terrarium mushrooms are so tough to ID. Maybe I'll get some spores under a microscope soon.
Mushrooms growing in this same terrarium:
1) https://www.inaturalist.org/observations/199958884
2) https://www.inaturalist.org/observations/198761646
3) https://www.inaturalist.org/observations/200873535
4)
Singular fruiting body growing from the ground in a mixed conifer and pine forest with madrone nearby.
Striate red cap with darkened center with yellow margin,
Stipe is yellow at base an darkens upward and has nattering,
Decurrent, white gills,
Growing in mossy duff off trail,
Near redwood/cascara,
White UV on gills,
No odor/taste
Spores ellipsoid, smooth, translucent. Fruiting under duff layer, directly on woody debris.
Maybe. . red spots on gills of older one.