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Panaeolus papilionaceus, also known as Agaricus calosus, Panaeolus campanulatus, Panaeolus retirugis, and Panaeolus sphinctrinus is a very common little brown mushroom.
[edit] Description
This is a little brown mushroom that grows in horse or cow dung and has black spores. The cap is up to 5 cm across, greyish brown, not hygrophanous, conic to campanulate in age. The cap margin is adorned with remnants of the partial veil. The stem is 10 cm by 2.5 mm, fiberous and pruinose. The gills are adnexed and close, with one or two tiers of intermediate gills.
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