Annulus fragile and membranous, white or dusted with dark brown spores.

The Sporormiaceae are characterized by having dark brown, septate spores with germ slits.

Often the lower surface of the segments is coated in a white dust, and the sporangia contain brown spores.

Species of Agaricus have brown spores and the gills of mature specimens are never white.

They are a subgroup of Panaeolus which have dark brown spores.

They are characterized by producing fruit bodies (mushrooms) with umbonate caps and rough brown spores.

Some also have brown spores rather than black.

Their brown spores often dust their stems and objects beneath them.

When mature, the cap contains powdery, dark brown spores.

The cap is flabby and has brown spores.