Well coprinellus grow abundantly almost everywhere.
They also grow in dense clusters like your picture.
And they can vary in size from small to large, unlike liberty caps which stay fairly small.
But to be honest, after you spot certain mushrooms enough times, you just know by the way they look.
But please don't infer that with experience you can bypass proper identification.
Some mushrooms have deadly lookalikes and some don't.
If you're unsure of you find, contact an expert.
If they're unsure, then throw it out.
There are plenty of great mycology forums online that have experts who are eager to identify fungi for you.
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