Cyathus olla Grey Bird's NestFruitbodies are up to 1.5 cm tall by 1 cm wide. Nests have flaring mouth with awavy margin. The outside is brownish and hairy, becoming smooth and greyish in age. Inside of 'nest' is metallic-grey to dull-black and smooth. Eggs are large and up to 3.5 mm across. It fruits on organic debris embedded in soil. Note the large size of the peridioles relative to the diameter of the cup.