Observation 137169: Amanita pseudovolvata Tulloss nom. prov.

When: 2013-06-07

Collection location: Big Thicket, Polk Co., Texas, USA [Click for map]

Who: Ron Pastorino (Ronpast)

Specimen available

Single specimen growing in mixed woods in the Big Sandy Creek Unit.
Cap 3.9 cm across with striations ~ 3mm.
Spores amyloid.
Spores ~ 7.9-11.0 X 5.0-6.1(6.8) microns.
Q(ave) = 1.57. Q(range) = 1.45-1.71.
With no sign of an appendiculate cap margin or partial veil on the stem, it’s difficult to know where to classify this one.
Looking over Rod’s checklist, Amanita pseudovolvata could be a weak possibility?

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Yes, a “could be”…would be…a good-ie - or should be.
By: R. E. Tulloss (ret)
2013-06-21 13:59:02 MDT (-0600)


Thanks for the comments Rod.
By: Ron Pastorino (Ronpast)
2013-06-21 12:01:59 MDT (-0600)

The gill examination sounds like a project for the dog days of July and without an over the shoulder tutor, I’m not sure I would be confident of my findings.
So it looks like that Amanita pseudovolvata is worth at least a “Could Be”?

The spore shape is consistent with pseudovolvata or, of course,…
By: R. E. Tulloss (ret)
2013-06-21 10:28:11 MDT (-0600)

something outside my experience.


By: R. E. Tulloss (ret)
2013-06-21 10:27:08 MDT (-0600)

has a unique structure to the subhymenium compared to other North American species of Amidella…at least so I think at the moment. If you make a cross-section of a gill and look a divergent tissues tracing arcs from near the center of the gill, downward and outward toward the bases of the basidia, most species will show this arc stopping and the cells (after arc stops) lining up perpendicular to the face of the gill (i.e., parallel to the longitudinal axis of the basidium); however, this doesn’t happen in pseudovolvata or happens only with the very last cell before you reach the base of a basidium.

If you can rehydrate the gill tissue and get a nice cross-section of the gill, you can see if this form of lamella trama and subhymenium is present.

Very best,


Created: 2013-06-21 09:28:03 MDT (-0600)
Last modified: 2013-06-21 13:57:53 MDT (-0600)
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