The message
from "Franz Heymann" contains these words:

Since there is at least one non-edible species which has the same growth
habit, please do check and make absolutely certain that your soecimens are
true Fairy Rings befoere eating them. There will quite certainly be folk in
your neighborhood who will know for certain what you have on your lawn.

Did you look at the picture? Agaricus campestris or A. arvensis I'd say
- certainly not Merasmius oreades.

--
Rusty Hinge
horrid·squeak&zetnet·co·uk
http://www.users.zetnet.co.uk/hi-fi/tqt.htm