A small to medium, delicate white-cream parasol mushroom with a powdery or floccose cap, a slightly darker disc, free gills, and a thin but usually persistent ring. Common in compost, mulch, garden beds, and rich organic litter, and occasionally found in native bush in New Zealand.

Cap: 20-80 mm, convex to plano-convex, sometimes with a low umbo. Colour white to cream, typically with a buff or pale brown disc. Surface powdery, granular, or finely floccose, especially toward the centre. Margin slightly translucent-striate when moist. Flesh thin, white, unchanging when cut.
Gills: Free, crowded, thin. White, sometimes becoming cream with age. Edges smooth. Do not darken (separates from Agaricus).
Stipe: 40-120 x 3-8 mm, slender, hollow or nearly so. White, sometimes slightly yellowish or cream near the apex. Ring thin, fragile but often persistent. Base sometimes slightly swollen but not distinctly bulbous.