Coprinus), any member of a group of about 100 cosmopolitan mushroom
species belonging to the order Agaricales. They are so called because, after spore discharge, the cap
disintegrates into an ink
like liquid that has been used for writing. They grow on wood
. The caps of C. atramentarius and C. comatus (shaggy mane, or shaggy cap) are edible
when young, before the gills turn black.
From the Encyclopedia Britannica