Pholiota terrestris
Grows in clusters at base of trees

Browish coloration
overall scaliness
Has a veil when young
dull brown spores

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Note several psathyrellas grow in clusters
They have darker spores and
they are not scally

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Michael Kuo says: "Pholiota terrestris is the only widely distributed and common species of Pholiota that habitually grows in dense clusters on the ground, rather than directly on rotting wood. It is fairly variable in its colors, but most collections involve caps that are some version of "brown." The most distinctive features, aside from the habitat, include the small scales on the cap and stem, and the fact that the stem is rather long in proportion to the cap."