Observation 112833: Amanita sect. Phalloideae (Fr.) Singer

When: 2012-10-06

Collection location: Moon Lake Park, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

Specimen available

Yellow annulus seemed gelatinous. Annulus appears to be drying brown.

Grassy area with hardwoods.

Proposed Names

-32% (3)
Recognized by sight: strongly striate margin, small bulb, annulus.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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It may be the warm to cold weather…
By: Dave W (Dave W)
2018-01-02 16:17:13 PST (-0800)

that produces some strange effects upon these Destroying Angels.

Spores are amyloid.
By: R. E. Tulloss (ret)
2013-04-25 12:35:14 PDT (-0700)

Hence, sect. Phalloideae. This business of striate margin is occurring in a number of your collections, David. We’ll watch to see if this has some significance in identifying the species involved. It could be just aging; or it could be specific to a species (or more than one).

Material is received, accessioned and in the queue. Thanks very much, again.


Collected more similar material…
By: Dave W (Dave W)
2012-10-11 10:01:19 PDT (-0700)

at Moon Lake. Found one white specimen that showed the sticky yellow ring and the striations along part of the cap margin. This latest specimen was collected about 150 yards from the collection seen in this obs (112833). The area was a grassy area near a hardwood border. I also got another specimen from the same small patch of lawn where I got the one seen here (112833).

Got a thick enough spore drop off each new specimen, and squeezed two drops out of my dwindling Meltzer’s…. Spores for these new (similar) collections amyloid.

Hope to make two new posts later this evening.

Thanks for the links, etc.
By: R. E. Tulloss (ret)
2012-10-10 09:26:31 PDT (-0700)

I’d go for the prescription route. Totally legit.


I also wondered about the striations.
By: Dave W (Dave W)
2012-10-10 08:39:12 PDT (-0700)

Here’s another collection taken maybe 300 yards from this one, made on the same day. Despite the marginal striations on the one cap, I proposed “Amanita bisporigera” for this collection.


Aside form the striations, these mushrooms (112829) appear to agree with other aspects of bisporigera.

Returning to the material in the obs here (112833), I did not propose bisporigera on account of the basal structure, which seemed a bit thin for bisporigera. However, the base is enclosed within a membranous limbate sac, which does remind me of Phalloideae.

I’ll stop by the collections site today to see if I can pluck another of these white amanitas. I’ve been saving one last drop of Meltzer’s, and if I’m lucky enough to get some additional material, and a spore drop, then this would seem a worthy use.

A friend told me that he convinced hi family doctor to write a prescription for Meltzer’s that he filled at a pharmacy. I haven’t tried this yet. Ant other suggestions on obtaining Meltzer’s?

The striate cap margin makes me wonder about placement…
By: R. E. Tulloss (ret)
2012-10-10 04:30:41 PDT (-0700)

in section Phalloideae. In a very large number of cases (not all), a striate margin of the cap in incompletely expanded material of Amanita is associated with spores that do not darken in Melzer’s Reagent (are not amyloid). Based on probabilities, then, this collection would be placed in subgenus Amanita (inamyloid spores). If that is a true bulb at the base of the stem, then this material would be placed in sect. Amanita.

Were you able to check the spores in Melzer’s, Dave?

Very best,


Created: 2012-10-08 16:47:56 PDT (-0700)
Last modified: 2018-01-02 16:17:13 PST (-0800)
Viewed: 104 times, last viewed: 2018-04-21 20:26:10 PDT (-0700)
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