Observation 186636: Amanita sect. Caesareae Singer
When: 2014-10-30
No herbarium specimen

Notes: This is a common “yard mushroom” in Baton Rouge, Louisiana. The photographed specimen appears to be mycorrhizal with a pecan tree. The vulva is tight-fitting and though remnants of the universal veil are visible on the caps of the younger species, they tend quickly to disappear as the cap unfurls. Uncharacteristically, the photographed specimen retains a few wisps of the veil on the stipe. Unlike this one, most fruiting bodies I have seen lack an annulus.

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I’m not sure I was clear…
By: R. E. Tulloss (ret)
2014-10-30 17:38:52 CET (+0100)

Section Vaginatae has no known members with a partial veil on the stem OUTSIDE OF a very few taxa known only from tropical central Africa and from tropical southeast Asia. Your material is almost certain to fall into section Caesareae.

The point I didn’t make very well is that if you have similarly colored material in your lawn that have both warts on the cap and no annulus on the stem, then THOSE mushrooms (not the one depicted) might be something like one of these:





I only know the latter from one damaged collection from Connecticut. However, I know the first three from widely geographically distributed collections in the eastern US including east Texas.

Very best,


I’ll take your word for it …
By: Logan Wiedenfeld (LoganW)
2014-10-30 16:20:02 CET (+0100)

Amanita rhacopus sure seems like a better fit. My reference material is limited, so I hadn’t even considered the above. Thanks again!

I wonder if you haven’t picked a second entity inadvertently. …EDITED
By: R. E. Tulloss (ret)
2014-10-30 15:57:58 CET (+0100)

I don’t think we can discount the presence of a partial veil. This could very well be a species of sect. Caesareae. I think that you may have a tannish species of the Amanitarhacopus” group (with volval [note spelling] remnants on the cap in addition to the present taxon, which is a little dark for A. murrilliana, but could be that taxon … or something I haven’t ever seen.

The graying partial veil suggested A. spreta, but it is a much more robust species with thick cap and (consequently) much shorter marginal striations. By the way, the paper rulers have one significant application. By measuring the cap diameter and the marginal striations ALONG THE CURVE OF THE CAP, you can best approximate the width of a flat cap and the ratio of the length of marginal striations to the radius of that flat cap. This ratio is of considerable taxonomic value by my observation.

Very best,


Created: 2014-10-30 15:09:07 CET (+0100)
Last modified: 2014-11-03 21:24:45 CET (+0100)
Viewed: 57 times, last viewed: 2016-10-27 03:27:12 CEST (+0200)
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