Measuring 3–7 cm (1.2–2.8 in) in diameter, the greyish or brownish-grey cap is initially bell-shaped,  is furrowed, and later splits.
The colour is more brownish in the centre of the cap, which later flattens before melting.
The very crowded gills are free; they are whitish at first but rapidly turn black and easily deliquesce.
The short stipe measures 7–17 cm (2.8–6.8 in) high by 1.5 cm in diameter, is grey in colour, and lacks a ring.
The spore print is dark brown, and the almond-shaped spores measure 8–11 by 5–6 μm.
The flesh is thin and pale grey in colour.
Measuring 3–7 cm (1.2–2.8 in) in diameter, the greyish or brownish-grey cap is initially bell-shaped,  is furrowed, and later splits. The colour is more brownish in the centre of the cap, which later flattens before melting. The very crowded gills are free; they are whitish at first but rapidly turn black and easily deliquesce. The short stipe measures 7–17 cm (2.8–6.8 in) high by 1.5 cm in diameter, is grey in colour, and lacks a ring. The spore print is dark brown, and the almond-shaped spores measure 8–11 by 5–6 μm. The flesh is thin and pale grey in colour.
Coprinopsis atramentaria