Observation 158923: Amanita Pers.
When: 2013-01-03
No herbarium specimen

Notes: No spore print available.

Proposed Names

28% (1)
Recognized by sight
63% (3)
Eye3 Eyes3
Recognized by sight: looks like a weird section Vaginatae
46% (2)
Recognized by sight: heavy UV, appendiculate margin, no annulus remaining, non-striate cap margin.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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I can’t tell if the gill edges are dark or if that is shadow.
By: R. E. Tulloss (ret)
2014-01-31 10:53:43 CST (-0500)

The fact that the stem is covered with grayish flocculence suggests that the same color would be on the gill edges.

Very best,

Rod

The dark gill edges…
By: Dave W (Dave W)
2014-01-31 10:41:36 CST (-0500)

seem interesting.

Yes.
By: R. E. Tulloss (ret)
2014-01-30 16:17:59 CST (-0500)

I don’t think it’s a lepidella either. I tried to make that point, but apparently I wasn’t clear.

The article in Mycologia is an interesting one. Glad you found it.

R

but this is obviously not a Vittadinae…
By: Debbie Viess (amanitarita)
2014-01-30 14:49:38 CST (-0500)

from savannah but a MR amanita from a jungle environment. And one we have never seen before, apparently.

Here’s a (incomplete) key to Amanita section Amanita in Brazil:

www.mycologia.org/content/101/3/395.full

I couldn’t find anything that resembles this interesting critter.

There MIGHT be a bulb buried in the substrate that we can’t see.

We can see an awful lot of UV left on that stipe, and at the cap margin, which still brings me back to lepidella.

I would suspect a friable annulus, too.

Actually, there are at least two lepidellas in Brazil.
By: R. E. Tulloss (ret)
2014-01-30 14:40:40 CST (-0500)

Amanita grallipes and A. lilloi. Amanita savannae comes up in the search that I suggested, but it is only known from wet savanna in Colombia. All three of these belong in Bas’ subsect. Vittadiniae and are thought to be non-mycorrhizal. These would not have a gelatinizing cap skin (because they don’t have a cap skin…the volva arises directly from the cap’s flesh). And they would have a mixture of vertical and horizontal rows of sausage like cells making up the volva of the cap. This structure tends to produce the kind of volval remnants that are seen on A. thiersii, A. nauseosa, A. pruittii, A. prairiicola, etc. in the U.S. The sausage chains tend to flop over to some extent and like radially on the cap’s surface.

Very best,

Rod

certainly an Amanita…
By: Debbie Viess (amanitarita)
2014-01-30 14:03:29 CST (-0500)

and a really cool one at that. w/out a specimen, though…it’s just a rumor.

Nice find, Susanne. We bitch because we care.

As to Lepidellas in Brazil…the absence of proof is not the proof of absence. But again, no specimen, no further section conjecture possible.

Good point
By: Christian (Christian Schwarz)
2014-01-30 13:57:22 CST (-0500)

I was focused primarily on the powdery/fluffy stipe.
Given how thin and translucent the cap looks in the second photo, it’s actually pretty amazing that it is not striate…

A thought….
By: R. E. Tulloss (ret)
2014-01-30 13:54:42 CST (-0500)

Those interested might try searching www.amanitaceae.org for the words “Brazil” and “Guyana”.

If both words are search together, the list or results will first produced the taxon pages that include both words on one tab or another, then (the alphabetic list of pages will restart) the pages will be list that include only one of the words.

Good luck.

Very best,

Rod

The absence of a ring on the stem…
By: R. E. Tulloss (ret)
2014-01-30 13:49:29 CST (-0500)

also makes it unlikely that this species could be placed in sect. Phalloideae or in sect. Validae…unless the ring was lost. The universal veil that does not have distinct layers separating in on the cap suggests that this species is not assignable to sect. Amidella. There are no species of sect. Caesareae to the east and south of the oak forest in the Colombian Andes; also, all the taxa of the Caesareae have ring on the stem. So I think we can say that sect. Caesareae is improbable.

Species of sect. Lepidella are very rare in Brazil so far as we know. All those that are thought to be indigenous are nonmycorrhizal; and these have a unique form of volva that would be very unlikely to form upright, pyramidal warts on the cap surface.

This leaves us with sect. Amanita, of which a number of taxa are known from Brazil, and a species of sect. Validae that has lost its ring.

Very best,

Rod

Oh, how sad there is no herbarium specimen. (EDITED)
By: R. E. Tulloss (ret)
2014-01-30 13:40:12 CST (-0500)

I agree that this could be an Amanita. Since the cap lacks radial striations on the margin, I’m inclinded to think that is probably not a member of section Vaginatae, Christian.

R

Created: 2014-01-30 12:35:28 CST (-0500)
Last modified: 2014-01-30 14:41:19 CST (-0500)
Viewed: 97 times, last viewed: 2016-05-29 21:50:20 CDT (-0400)
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