I found keys already before posting this thread but I didn't find them to be too helpful- I quite like this one (
PANAEOLUS in the Pacific Northwest) and want to do a UK version of it.
Hopefully I'll be getting a microscope in the next few months.
Pans that I have found this year:
panaeolus/Panaeolina foenisecii (Very common)
panaeolus cinctulus (quite common)
panaeolus papilionaceus (Very common)
panaeolus acuminatus (very common)
panaeolus olivaceus (Very common)
Panaeolus fimicola (Only found a few times but wasn't 100% certain)
I still sometimes get them mixed up though and I'm sure that there's more that I've found but haven't realised what they were and some that I'm just not 100% certain about.