Observation 106594: Amanita ravenelii (Berk. & M.A. Curt.) Sacc.

When: 2012-08-23

Collection location: Griffey Lake, Bloomington, Indiana, USA [Click for map]

Who: Stephen Russell (Mycota)

No specimen available

Proposed Names

20% (2)
Recognized by sight
82% (1)
Recognized by sight: There is a very distinctive basal filamentous layer to the warts. This is very clear in the close-ups of the volval warts on the cap.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Amanita rhopalopus seems to be a bit more rare than I had thought.
By: R. E. Tulloss (ret)
2012-08-24 09:00:25 CDT (-0400)

The volva is very powdery and makes for poorly formed wart. The basal bulb is often (but, unfortunately, not always) doglegged with respect to the stipe (i.e., bent off to one side). The spore size and shape is almost exactly like that of A. ravenelii…another thing that doesn’t help. In his 1969 masterwork, Dr. Bas emphasized the fibrous lower layer of the volva in his discussion of A. ravenelii…he clearly used this character as the surest approach to recognizing the species.

Amanita ravenelii has caused me some trouble, too. A few years ago I received a specimen that was described as having gray warts; and I hastily ID’d it as cinereopannosa. Recently my colleague Dr. Zhu-liang Yang asked for some specimens of cinereopannosa for DNA sampling; I heard back from him that there were two different species among the specimens I sent. Embarrassed, I looked at the specimens. The one that I had accepted as “gray warted” without checking, when placed under the dissecting scope (60X) clearly had a distinct lower fibrillose layer to the warts on the cap…the best fit I have ever seen to Bas’ description of A. ravenelii. OOooooops. I informed Dr. Yang that, inadvertently, he now had a sequence for A. ravenelii. :( :)

Very best,


By: Stephen Russell (Mycota)
2012-08-24 00:34:31 CDT (-0400)

I suppose I will get it right some day…

From the images of the warts, I think this is…
By: R. E. Tulloss (ret)
2012-08-23 23:06:22 CDT (-0400)

Created: 2012-08-23 21:06:15 CDT (-0400)
Last modified: 2012-08-23 23:08:19 CDT (-0400)
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