Observation 167941: Amanita spreta (Peck) Sacc.
When: 2014-06-16

Notes: Found in the Turkey Creek Unit of the Big Thicket National Preserve.
Single fb growing on the ground in mixed woods.
Cap 3.8 cm across and slightly tacky.
Gills were a pale yellow.
Striations 7-8 mm long.
Spore print was white and appeared to be weakly amyloid.
Spores ~ 9.1-12.8 X 5.5-8.1 microns, ellipsoid to elongate.
Q(range) = 1.42-1.83. Q(ave) = 1.61.

Proposed Names

28% (1)
Recognized by sight
54% (3)
Eyes3
Based on microscopic features: spores within range of spreta: 9.3 – 13.1 × 5.9 – 7.9, hyaline, colorless, thin-walled, smooth, inamyloid, ellipsoid to elongate, infrequently cylindric; apiculus sublateral, cylindric, proportionately small; contents granular to mono- or multiguttulate (when guttulate, additional small granules often present); white in deposit.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Thanks Ron,
By: groundhog
2015-07-07 11:37:22 CDT (-0500)

This material has arrived and was accessioned to Rod’s herbarium. We have scheduled it for DNA sequencing.
-Naomi

The species of sect. Amanita that have both bulb and sac at the bottom of the stem…
By: R. E. Tulloss (ret)
2015-06-17 15:56:44 CDT (-0500)

Have a bulb that is fairly obvious in fresh material. It can be very difficult to distinguish in dried material. I don’t see any sign of a bulb in Ron’s photos. So I will take the risk of favoring placement in the Caesareae.

All the bulb-plus-sac species of sect. Amanita that I can think of at the moment are South American and African species (from Chile, Brazil, Guiana, and central Africa). Considering the similarity of many species in sect. Amanita in eastern Australia and Chile, it is possible that bulb-plus-sac amanitas might be found in Australia. I don’t know of a case. however.

Very best,

Rod

I’ll see what I’ve got when I get back home…
By: Ron Pastorino (Ronpast)
2015-06-17 14:39:47 CDT (-0500)

Am currently dodging thunderstorms in the Ark-La-Tex area.
Will send what I have to you Rod.

Hello, Ron.
By: R. E. Tulloss (ret)
2015-06-17 13:11:00 CDT (-0500)

Did you see two-spored basidia on this critter?

It could be in the virginiana/pachysperma group within section Caesareae and they have a noticeable number of two-spored basidia on their gills.

Very best,

Rod

I agree that this material is possibly…
By: R. E. Tulloss (ret)
2015-06-17 13:08:16 CDT (-0500)

placeable in sect. Caesareae.

I would be very interested to take a look at the material, Ron.

Very best,

Rod

Yep,
By: I. G. Safonov (IGSafonov)
2015-06-17 12:41:38 CDT (-0500)

definitely and oddball that causes plenty of head-scratching. This one appears to have a totally elongating, bulbless stipe, making sect. Amanita an unlikely possibility. But… the Argentinian A. pseudospreta, a member of sect./subsect. Amanita, has a saccate volva and possibly a bulbless stipe, so anything is possible.
Yes, this looks like a good candidate for sequencing. I am surprised this obs went unnoticed by Rod.

ah, believe it or not …
By: Debbie Viess (amanitarita)
2015-06-17 12:17:59 CDT (-0500)

I have never seen spreta! I understand it is common in your neck of the woods, though!

There doesn’t appear to be a bulb there, either.

Yeah, like I said, an oddball. DNA would at least give us a fighting chance for a subgenus!

But it is the mushrooms that don’t fit neatly that are the most fascinating. There is usually a reason that the round peg won’t fit into the square hole, no matter how hard we try to push it in.

Debbie,
By: I. G. Safonov (IGSafonov)
2015-06-17 12:12:07 CDT (-0500)

Amanita spreta has warts on its cap. Can you point to an Amanita sect. Validae with a well-developed saccate volva?
Maybe this is a case of morphological/phenotypic plasticity. :-)

I get that I.G.!
By: Debbie Viess (amanitarita)
2015-06-17 12:01:47 CDT (-0500)

but I have never seen a warted caesar.

we do sometimes see an Amanita in section Amanita with a membranous volva, obviously warts, and striations too … breckonii/exannulata/pseudo-breckonii comes to mind.

Debbie,
By: I. G. Safonov (IGSafonov)
2015-06-17 11:51:08 CDT (-0500)

The spores “…appeared to be weakly amyloid” — this language indicates uncertainty. When you pair that with the morphology, it would seem that this specimen rather belongs to sect. Caesareae.

what an oddball amanita!
By: Debbie Viess (amanitarita)
2015-06-17 11:09:36 CDT (-0500)

so, where in subgenus Lepidella would this one fall?

amidella? no.
phalloideae? probably not.
lepidella? hardly.
validae? maybe. I wonder how long that somewhat membranous UV at the base would last, once the cap is open?

could the “slightly blue” spore color be an artifact, rather than a certainty? and this be one from section Amanita, instead?

a good candidate for the DNA lab!

Created: 2014-06-20 13:31:16 CDT (-0500)
Last modified: 2015-07-07 11:33:44 CDT (-0500)
Viewed: 98 times, last viewed: 2016-03-09 17:04:17 CST (-0600)
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