C. comatus - habitus; please note the
It's a large fungus. The cap can reach heights until 10 centimetres (4 inches) and has 3 cm (1,25 inches) in diameter. The young cap is egg-shaped and long. With age, the cap spreads out and becomes bell-shaped. The colour of the young mushroom is white. The surface of old caps is scaly and fibrous.
C. comatus - fungi on a turf in a park
The gills of the young fungus are white and will become pink with time. The black spores are eliptical.
Probably, the most interesting feature of this fungus is the peculiarity of the cap to dissolve into a viscous black liquid. This liquid reminds of ink, what gave the species also the name “ink cap” or “Tintenpilz”. In this way, C. comatus spreads out its spores.
C. comatus - (unsharp) picture of some fungi
C. comatus is native to the whole Northern hemisphere. In Middle Europe, this fungus can be found in September (however, I've also found individuals in November). It's a typical “city fungus” and can be found in parks, at roadsides and on turfs. A speciality of this fungus is, that it also catches and eats nematodes.
Young mushrooms are edible and have a good taste, but you have to hurry, because shortly after collecting, the cap will dissolve in that inky liquid.