Can you see any sign signs or the remnants of a ring or veil hanging midpoint +/- on the stem? Anyways, definitely not an edible and likely not poisonous either. Likely an agrocybe or paneolous. If the stem is super brittle / shredding and you dig and find it growing from a piece of wood then it maybe a psathyrella.
These little brown spored mushroom often need microscopy work.