2011-10-09 Vienna XXII. district, Donauinsel (160 msm Quadrant 7864/2).
See Index Fungorum/ Species Fungorum for synonymy.German name: SchopftintlingLike all mushrooms of genus Coprinus (all the edible ones, obviously) you have to gather them when they're still young, when their flesh is still a pure white; and even then you need to be quick to get them home and cook them - if you leave them lying around for too long they still will turn black, and inedible: a few hours wait could be too long already, depending on the stage of development when you're gathering them.Also, there's yet another problem with this genus: one shouldn't consume alcohol before, during and after eating the meal, even though
C. comatus isn't known for strong problematic reactions with alcohol some of its cousins are, and for this reason I would highly recommend being careful with all of them.See also distant relative
Coprinopsis picaceae.