Observation 24352: Amanita magniradix Tulloss nom. prov.

When: 2009-08-15

Collection location: Wayne National Forest, Athens Co., Ohio, USA [Click for map]

Who: Dan Molter (shroomydan)

No specimen available



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22% (2)
Recognized by sight
-8% (2)
Recognized by sight

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Backed off….
By: R. E. Tulloss (ret)
2009-08-17 10:56:56 CDT (-0400)

See observation 24444 for the original photograph of “species 9” = “magniradix” with relevant discussion. The largest number of rings of volval warts that I’ve recorded on the lower stipe and upper bulb of sp. 9 is 6. I see about 7 or 8 rings in these photos. In a year of luxuriant mushroom growth (like 2009), more material on a larger fruiting body would not be unusual. Notice that the bulb becomes more slender as the mushroom matures. This alteration in the shape of the bulb should be taken into account and may not indicate a species difference.

If we had dried material,…..

Very best,



By: R. E. Tulloss (ret)
2009-08-17 10:21:24 CDT (-0400)

Thanks for the comment, Paul. I’m going to go back to my notes on “sp. 9.”


This mushroom
By: Paul Derbyshire (Twizzler)
2009-08-16 17:32:05 CDT (-0400)

and http://www.mushroomobserver.org/12997 don’t look like they can be the same species. The latter has few to no warts on the stipe, no bulb, and a different shape and stature. That’s three differences in field characters.

By: R. E. Tulloss (ret)
2009-08-16 10:21:59 CDT (-0400)

Amanita magniradix is treated as “sp. 9” on the NJ Pine Barrens Amanita page:



uh oh
By: R. E. Tulloss (ret)
2009-08-16 10:12:36 CDT (-0400)

The bottom picture shows why I shouldn’t GUESS so quickly. It looks as if there were a very long “root” extending down from the bottom of the bulbs.

I suspect that this baby is NOT rhopalopus after all. The long radicating addition to a rhopalopus-type bulb is a field character for A. magniradix Tulloss nom. prov. If you can revisit the site and if the species is still present, look to see if the cap’s “skin” extends beyond the ends of the gills for a few mm.
Another way of say this is that the appendiculate “goop” on the cap edge is hanging from a firmly structured (not “goopy”) extension of the cap’s pileipellis or “skin.” This is a second field character of magniradix.

In the lab, one can see that the spores of magniradix are distinctly more narrow (proportionately) than the spores of rhopalopus. The bulb of rhopalopus is usually not so complexly decorated with warts (see the rhopalopus web page on the Amanita Studies web site).

Sorry about the misdirection. My mistake.

Very best,


By: Dan Molter (shroomydan)
2009-08-16 08:28:34 CDT (-0400)

This name is fun to say. Shown here in all it warty-rooted-stinky glory :)

Created: 2009-08-15 22:16:02 CDT (-0400)
Last modified: 2009-08-15 22:16:02 CDT (-0400)
Viewed: 145 times, last viewed: 2018-04-24 20:57:41 CDT (-0400)
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