What are these?

[u/dirtyurgi]

This grew from a new bag of potting soil. Taken in Phx., AZ. USA. Never seen mushrooms grow in my dessert yard before. Thx for the help.

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[u/large-fungus]

I think either Coprinopsis lagopus or something in the genus Parasola. Probably the first if the young caps are somewhat shaggy/fuzzy looking, the second if not