Observation 169680: Amanita magniradix Tulloss nom. prov.
When: 2014-07-10
No herbarium specimen

Notes: Found in rich, rocky soil under mountain laurel and mixed hardwoods. Smell like clean, spring-time fresh, chlorine. Warts are flocculose, as are scales on stipe and litter around the base of the mushrooms. Two potential sites for a partial veil seem possible here. One is apical, the other is the unusually broad and ring-like scale formation about a third of the way down on both specimens.

Proposed Names

15% (2)
Eye3
Used references: Studies in the Amanitaceae species page

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
A well-dried specimen (even of an immature specimen) might yield DNA
By: R. E. Tulloss (ret)
2014-07-14 04:14:23 PDT (-0700)

and I would be grateful to have it.

The very floccose nature of the volva in this material would argue against A. ravenelii as a possibility. The volva of raveneliii is quite distinctive, comprising firm and roughly pyramidal warts on an distinctly fibrous underlayer. Patrick Harvey and others have posted very nice close-ups of the volva on the cap of ravenelii on MO. One of those images (the one called “the face on Mars”) is also posted on www.amanitaceae.org on the ravenelii page.

I agree with your judgment concerning the unlikeliness of A. longipes being a good name for the present mushroom due to the odors that you report in the present case (and the relatively more extended length of the bulb in your photos).

If you are lucky enough to get another fruiting of this mushroom this year or next, you may find that the size varies a great deal; and, since the number of collections of A. magniradix is not very large, the description may not be based on specimens with a full range of possible sizes.

Of course, it is an undeniable possibility that you have found something that is not yet described.

Very best,

Rod

Interesting
By: Mike Hopping (AvlMike)
2014-07-13 21:57:09 PDT (-0700)

This isn’t a large mushroom. The caps in the picture of mature specimens were at the low end of the scale. The length of the stipe in the button shown in the other second observation you commented on is 8 cm. The bulb is 9 cm x 2.6 cm max. Due to an impending thunderstorm I didn’t collect the mature specimens but the fully expanded caps were in the ballpark of 9 cm diameter. We probably have A. rhopalopus or A. ravenelii here. It smells like old ham and is humongous by comparison to this guy. Those caps are nearly the size of a dinner plate and the baking potato diameter root can go on forever. A. longipes seems closer except for the lack of a strong but clean and inoffensive chlorine smell.

I’m drying the button from Observation #169681. Do you want it?

This photo is very nice.
By: R. E. Tulloss (ret)
2014-07-13 21:09:50 PDT (-0700)

It shows that there is a sterile margin of the cap that extends beyond the ends of the gills. This is a character that I’ve noticed in A. magniradix. I think that is a good possibility for an ID of this mushroom. My second choice is the rather closely related A. rhopalopus.

Very best,

Rod Tulloss

Created: 2014-07-13 17:46:05 PDT (-0700)
Last modified: 2014-07-13 21:11:56 PDT (-0700)
Viewed: 28 times, last viewed: 2016-10-25 00:20:19 PDT (-0700)
Show Log