This observation is being uploaded as a step in getting it sequenced; the collector is not an iNat user and sent it to me to process for DNA testing.

It was found fruiting on a piece of wild-collected driftwood that was boiled and placed in a fish tank. The fruiting appeared approximately 3 weeks after the driftwood was collected.

The second picture of the mushroom is around 12 hours after he first noticed it.

Likely not Psathyrella aquatica, most opinions on facebook were suggesting Coprinellus sect. domestici so that is my initial ID but it is for sure not confirmed that and will be sequenced soon.

Images used with permission