Observation 109034: Amanita crenulata Peck

When: 2012-09-07

Collection location: Oneida Co., New York, USA [Click for map]

Who: Eric Smith (esmith)

Specimen available

Proposed Names

9% (2)
Recognized by sight: Growing in sand dune under pine. Didn’t strike me as Amanita crenulata. Smaller bulb, different volva.
42% (3)
Eye3 Eyes3
Based on microscopic features: See comments.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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I hope I get the opportunity to obtain DNA sequences from species of…
By: R. E. Tulloss (ret)
2013-06-30 23:55:51 CDT (-0500)

sect. Amanita in the not too distant future. A lot of effort has been put into sequences of muscarioid taxa; and some other taxa are “going begging” at the moment.

Very best,


I can’t discount
By: Eric Smith (esmith)
2013-06-30 20:29:56 CDT (-0500)

the possibility especially so long after the fact. Obviously I didn’t think so at the time…

As you already noted, Rod the older specimens suffered from a little in situ drying. I can’t say with any certainty how that has affected their appearance outside of that it likely the cause of the sulcate margin that can be seen on the cap.

The habitat is an open area within an oak/pine barrens with very sandy soil with some grass growing adjacent to lichens and mosses.

I’ll add a pic where you can see that the annulus on one of the larger specimens is much more median than the more apical annuli on the smaller specimens.

I find quite a few of these, of what I call crenulata-like Amanita in this specific area.

Could the collection be mixed?
By: R. E. Tulloss (ret)
2013-06-30 18:31:26 CDT (-0500)

I still have this sense that I’m looking at a species of sect. Validae with regard to the largest fruiting bodies.



My own collections of what I have IDed as A. crenulata…
By: Dave W (Dave W)
2013-06-29 22:20:37 CDT (-0500)

have clavate stipe without abrupt bulb, and the champaign deposits are often absent. Also, the ring, when present, tends to be thin and sometimes slightly yellow. If I have mistakenly IDed something else as A crenualta, then it may be the same type as the collection seen here. I most often find this type under spruce, or mixed woods with conifers present.

By: Eric Smith (esmith)
2013-05-17 15:57:59 CDT (-0500)

for the update, Rod!

Eric, I’m going to accession your material as…
By: R. E. Tulloss (ret)
2013-05-17 08:46:20 CDT (-0500)

Amanita affin. crenulata for the time being.

Very best,


REVISED – On the other hand, the shape of the bulb and the apparent thickness of the warts…
By: R. E. Tulloss (ret)
2013-05-17 01:11:46 CDT (-0500)

do, as Eric says, make one feel uncomfortable about calling this material crenulata. The form of the warts is really only visible in detail on the oldest specimen, in situ drying and aging have certainly affected things like the striations on the cap margin (which are not at all prominent where visible on the younger specimens) on the oldest specimen and could have altered the appearance of the warts.

Environmental impacts can remove the powder from the bulb. The first time I looked at the bulb, I immediately thought of species in sect. Validae (but the spores appear to me to be inamyloid). The specimen seems to be appropriately placed in sect. Amanita.

Very best,


A little info on this collection…REVISED
By: R. E. Tulloss (ret)
2013-05-17 00:50:22 CDT (-0500)

Basidiospores: [20/1/1] 7.0 – 8.8 x (5.2-) 6.0 – 7.7 (-7.9) um, (L = 8.0 um; W = 6.8 um; Q = (1.10-) 1.11 – 1.23 (-1.35); Q = 1.17), inamyloid.

While the spores are a little smaller than those from the much larger sample reported on http://www.amanitaceae.org?Amanita+crenulata, they are within the range of size of spores provided there. The range of Q values is almost precisely the same in the two cases.

Very best,


Created: 2012-09-07 20:07:44 CDT (-0500)
Last modified: 2018-01-02 16:17:05 CST (-0600)
Viewed: 90 times, last viewed: 2018-05-04 15:30:51 CDT (-0500)
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