Hypholoma brunneum is a wood-rotting fungus grows on decaying wood usually in dense clumps, possibly only in Australia-NZ.
It has a brown to dark brown cap, to 60 mm, with whitish scales towards the margin. The gills are yellowish to greenish, darkening as spores develop; spore print purple brown. The stem is fibrillose, especially towards the base, colour pallid to pale brown, with a fibrillose ring of fine veil remnants. Original public domain image from Flickr