Pleurotuellus acerosus (Fr.) Konrad & Maubl. Kleiner Seitling. Cap 1–3cm across, somewhat kidney-shaped, often lobed, dark grey-brown when moist drying pale grey, margin downy, white. Stem 5–10 x 5–10mm, lateral, white. Flesh thin, pallid. Gills adnate to decurrent, greyish. Spore print white. Spores pip-shaped, 7–8 x 3–4um. Habitat on rotting wood or rich humus on the ground amongst moss. Season late summer to early winter. Uncommon. Edibility unknown. Found In Europe.