Observation 136750: Amanita peckiana Kauffman

When: 2013-06-09

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

Who: Ron Pastorino (Ronpast)

Specimen available

These were growing in mixed woods(mostly pine) in the north portion of the Turkey Creek Unit.
Caps up to 7.9 cm across. Caps with striations up to 7mm long.
Spore print was whitish to creamy.
Spores were amyloid and ~ 11.3-13.3(14.0) X 4.9-5.3(6.0) microns, cylindric and smooth.
Q(ave) = 2.40. Q(range) = 2.15-2.66.
Did not detect a strong odor.
Another group I find difficult to classify unless I assume younger versions were somewhat appendiculate. Gills do protrude on the edges of the cap in age . I’ll say a possible Amidella for now.

Proposed Names

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Recognized by sight

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Add Comment
Don’t go after yourself, Ron.
By: R. E. Tulloss (ret)
2013-06-18 14:55:34 CEST (+0200)

Amidellas are a royal pain. Dr. Bas wanted to do a world monograph on them after he did his Lepidella monograph in 1969. I was fascinated with them when I first met Dr. Bas. He shared everything he had with me, and I studied the type collections in Peck’s herbarium; and I began to find new species as well. But it was too early for me; and there were many things that I did not understand about microscopic anatomy and how it can be destroyed by time, bad drying, bad collecting, and inadequate maintenance of specimens in herbaria. All of these impacts have had inevitable impact over the period (over a century) in which many of the types have existed. Frankly, I made a mess of things (restricted mostly to my own notebooks, thank goodness). When I came to realize the value of the subhymenium and lamella trama anatomy, I had created an enormous mountain of data that had become questionable. I hope that DNA will help separate the taxa. I may have to throw out alot of data and start over with fresh collections. Being young has wonderful aspects, but it is also a time when you learn a great deal from making mistakes. ’Nuff said.

Very best,


Thanks Rod, I’m a little angry at myself
By: Ron Pastorino (Ronpast)
2013-06-18 02:26:42 CEST (+0200)

as it is the first species listed on your checklist for Amidellas for the region.
At least it seems to be rather rare, on MO anyway, and it is another first for me.

Nice pix…including the spores.
By: R. E. Tulloss (ret)
2013-06-18 01:51:16 CEST (+0200)

You’re right, Ron. The appendiculate cap margin is very transient in many taxa of Amidella. In the case of peckiana, barely open buttons show a thin partial veil, which rapidly and completely disappears. In the NY State Museum, there is the type collection sent to Peck by Kauffman with a letter telling Peck to look at the smallest specimens. Kauffman was really happy that he had dried a little specimen that had not yet lost its partial veil.


The slight squat shape, pale staining of the volva and surfaces, …
By: R. E. Tulloss (ret)
2013-06-18 01:46:10 CEST (+0200)

The Q value and the range of Q are all a pretty good match to my current concept of Amanita peckiana. I’m a gonna vote for that un.


Created: 2013-06-18 01:06:25 CEST (+0200)
Last modified: 2013-06-18 01:47:04 CEST (+0200)
Viewed: 153 times, last viewed: 2018-01-09 22:52:43 CET (+0100)
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