Observation 215837: Amanita elliptosperma G.F. Atk.
When: 2015-09-09

Notes: Growing under red oak, sugar maple and beech. Spore print white. Spores from spore print 8.7 (7.7 – 9.3) x 6.3 (5.7 – 6.9) µm (Q=1.4) with prominent hilar appendages. Basidia 4-sterigmate. Did not notice thick cell walls in inflated cells in the universal veil tissue, but I also wasn’t entirely sure what I was looking for. Did not try KOH on the specimen when it was fresh but 5% KOH did not cause a color change on a dried piece of cap.

Spores measured:

8.9 × 6.3 µm
7.7 × 5.7 µm
8.3 × 6.0 µm
8.8 × 6.2 µm
9.3 × 6.9 µm
9.0 × 6.2 µm
8.8 × 6.1 µm
8.1 × 6.4 µm
8.9 × 6.2 µm
8.9 × 6.7 µm
8.8 × 6.2 µm

Images

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DSCN9041.JPG
555203
DSCN9042.JPG
613223
1310595263718.jpg
Spores in 5% KOH under 100x lens.
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Blurry photo of basidium showing 4 sterigmata. In 5% KOH and phloxine under 100x lens.

Proposed Names

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
I’d say smooth membranous.
By: Django Grootmyers (heelsplitter)
2016-04-25 16:28:48 EDT (-0400)

It was definitely a bit tattered, but it didn’t seem unusually thick or felted. The spore print was pretty faint too. If you’re interested I could send you this specimen.

I used your data to create a sporograph and compared it to species in…
By: R. E. Tulloss (ret)
2016-04-24 08:07:12 EDT (-0400)

section Phalloideae.

It shows, as you might expect, that the material was over the hill when the spores were dropped. They are very small for all of the candidate species. No real news in that, I suppose.

Very best,

Rod

I see we didn’t discuss the partial veil.
By: R. E. Tulloss (ret)
2016-04-24 07:43:55 EDT (-0400)

Was it rather thick and felted or thin and smooth-membranous?

Very best,

Rod

That’s a thought.
By: R. E. Tulloss (ret)
2015-09-10 13:14:58 EDT (-0400)

From poisoning cases, I know that the odor of decaying carrion attracts dogs. I’ve been involved in a number of cases in which a dog died from ingesting a foul smelling Amanita.

Very best,

Rod

It is a bit old.
By: Django Grootmyers (heelsplitter)
2015-09-10 12:45:39 EDT (-0400)

The flesh was kinda soft and the gills turned a bit yellowish. It smells like dead meat, but specifically like dead molluscs. If you’ve ever picked up a shell on a beach only to find that there’s was flesh inside and it’s been sitting in the sun for a while, that’s what it smells like.

Do you think this odor could attract beetles or other insects that would aid in spore dispersal?

Hello, Django.
By: R. E. Tulloss (ret)
2015-09-10 09:51:22 EDT (-0400)

This specimen looks a bit old. The cap seems to be sagging a bit.

Many old specimens of the Phalloideae get a distinctive, sweet, but repulsive smell (like carrion).

Was there a noticeable odor in this case?

Very best,

Rod

Created: 2015-09-10 04:35:18 EDT (-0400)
Last modified: 2016-04-24 06:35:02 EDT (-0400)
Viewed: 90 times, last viewed: 2016-12-02 12:53:50 EST (-0500)
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