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This evening I went back to the same field from the other day, and found more Psilocybe cubensis (they're in a lot better shape). I also found some mushrooms that I couldn't identify, I didn't bring any home with me and I didn't get a spore print. So I'm going to have to just describe them as I remember them.
They're a lot like the cubensis that I've been picking, they have the same smell they're about the same size (maybe a little bigger), the colors are close (these are more white, but the middle of the caps are still tannish color).
The differences though are that these have white gills and they bruise a rust color (very quickly, like cubensis turn blue). Also, they were not found growing from dung, they were in a large fairy-ring spaced pretty far apart.
Anyone know what these might be? Sorry I don't have more information.
I'll assume that you've seen photos of Tricholoma populinum along with reading a description. In order to be sure we need to know what kinds of trees they were growing near.
You also noted that they smelled the same as Psilocybe cubensis. T. populinum has a strong farinaceous (mealy) odor. If your specimens didn't smell strongly of meal, then that would suggest Tricholoma ustale, a nearly identical looking species which is lacking in odor.
In general, your description matches the group of mushrooms similar to Tricholoma pessundatum, of which T. populinum is the only one considered edible.