The persistent base of the peridium is also characteristic, very prominent sometimes, and visible to the naked eye.
The peridium breaks in various ways to permit the spores to escape.
The peridium is round or conical and it dehisces by breaking away at the base.
The opening of a peridium, when ripe, to discharge the spores.
The surface of the peridium is smooth, dingy-white or ash-colored, with minute white spots, due to scales.
The calcareous deposit on the peridium is usually very rich and under a lens appears made up of countless snowy or creamy flakes.
In dehiscence, the base of the peridium in cup-form, sometimes persists.
This beautiful species shows a peridium as distinctly double as in any diderma.
The peridium is round, often slightly depressed above, plicate below, where it is abruptly contracted into a long stem-like base.
The lower part of the peridium is sometimes persistent after the dehiscence, and so far reminds of Craterium.