Observation 49604: Amanita magniradix Tulloss nom. prov.

When: 2010-08-03

Collection location: Madison School Forest, Verona Township, Wisconsin, USA [Click for map]

Who: Steve Nelsen (sfnelsen)

No specimen available

Amanita white-scaley exceptionally easily removed flocky scales, cap 6.5 stem 12 cm above the ground, x 0.12 at apex. > 5 cm root underground. The veil was still covering the gills. No marked odor detected, nor taste in stem. There was slightly mealy taste in cap flesh. spores amyloid, cylindrical, larger maybe 11.5x 5½ microns. I found what I believe to be exactly the same thing at the School Forest on August 16, 1981, and have been unsuccessfully looking for it ever since. I do not think that it is very common in Wisconsin. In that case I did get a photograph including much of the root, which looks just like the one in the 2010 example, but I did not look at the spores in 1981. The 1981 example did have a chlorine odor, but the 2010 one did not.

[admin – Sat Aug 14 02:02:32 +0000 2010]: Changed location name from ‘Madison School Forest, Verona Township, Dane Co. Wisconsin USA’ to ‘Madison School Forest, Verona Township, Wisconsin, USA


This one did smell like chlorine (bleach).
from 8/16/81
8/16/81. Here I got a picture of the root, which looks just like the one on the 2010 specimen.

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cool lepidella Steve.
By: Debbie Viess (amanitarita)
2010-08-04 14:20:12 CDT (-0400)

You are finding some very nice mushrooms!

Sorry, Steve, that was my senility speaking…
By: R. E. Tulloss (ret)
2010-08-04 14:10:50 CDT (-0400)

I edited the correct name into the previous comment.

A couple of the pictures lower down the page show a sterile margin flaring a bit outward from the cap’s edge. A sterile margin several mm wide is another character that seems typical of A. magniradix.

Very best,


Amanita chlorinosa…
By: R. E. Tulloss (ret)
2010-08-04 13:14:32 CDT (-0400)

has more of a clavate stem and no rooting base. It is not a very common species in my experience. I think that this is the most western specimen of A. magniradix that I have heard of. I would really like dried material if it the species is encountered again. My postal address is on my summary page on MO.

Very interesting specimen and photos.

Very best,


Created: 2010-08-04 11:38:59 CDT (-0400)
Last modified: 2011-03-31 11:24:00 CDT (-0400)
Viewed: 58 times, last viewed: 2017-07-20 16:33:39 CDT (-0400)
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