Coprinus comatus aka Shaggy mane is a common mushroom found growing along roadsides, front lawns, and waste sites. Apparently it grows in Iceland (which I will definitely be looking into come June 2018!)
The young mushrooms, before the gills start to turn black, are edible. The taste is mild; cooking produces a large quantity of liquid. My interest in the Shaggy Mane is to experiment with their ink, which is apparently light fast. I have been looking into growing them, and asking friends within Ontario to harvest them onsite- and I will either pick them up, or pay for shipping.