The message
from "Mary Fisher" contains these words:

Coo yes - Amanita muscaria without a doubt. It was this mushroom the
Norsemen took before going berserk.

Evidence?

Learned tomes on the subject. Dr. John Ramsbottom (Onetime Curator of
Dept. of Mycology, British Museum of Natural History) refers to it,
though cautiously, in Mushrooms and Toadstools in Collins' New
Naturalist series.

I have about twenty mycological books and I'm not trawling through the
rest to find references. I haven't visited the Shed yet, and it's nearly
nine already!

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