Observation 202332: Amanita praeclara (A. Pearson) Bas
When: 2015-04-05
No herbarium specimen

Notes: Large, creamy colour, cap diameter 90-110mm, sticky scaly cap, sticky scaly stalk, bulbuous base, sweet-nutty smell, on lawn.

Images

514842
IMG_5636_1.jpg
mature specimen
514843
IMG_5640.JPG
lamellae and skirty ring
514844
IMG_5478.JPG
514845
IMG_5461.JPG
young specimen
514846
IMG_5443.JPG
bulbuous base
514847
IMG_4705.JPG
very young specimen

Proposed Names

ret
27% (1)
Recognized by sight: See comments, below.
ret
27% (1)
Based on chemical features: Genetically most similar to A. thiersii. The buttom is very similar to the drawing of the button of A. praeclara in Bas’ thesis.
ret
54% (1)
Eyes3
Based on chemical features: As previously noted.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Again, that is supportive of this being A. praeclara.
By: R. E. Tulloss (ret)
2016-07-05 11:03:01 CDT (-0500)

Thanks.

Very best,

Rod

Lamellae colour
By: Liz Popich (Lizzie)
2016-07-05 01:37:39 CDT (-0500)

Gills are creamy colour not yellowish.

What was the true color of the gills in your experience with this material?
By: R. E. Tulloss (ret)
2016-07-03 15:18:31 CDT (-0500)

The yellow is awfully bright in the photograph of the gills below the cap.

Very best,

Rod

We did manage extract to DNA and obtained a moderately good nrLSU…
By: R. E. Tulloss (ret)
2016-07-03 15:14:18 CDT (-0500)

sequence. Unfortunately, we did not obtain the second sequence for which we were trying. From the data we have, this species is a member of Amanita subsect. Vittadiniae and is likely not to be mycorrhizal. So growing in a lawn was a good clue as to what this might be.

I will need to get some microscope time to work this one out further.

Very best,

Rod

Thanks Liz,
By: groundhog
2015-06-05 11:53:15 CDT (-0500)

This material has been received and accessioned to Rod’s herbarium. We have scheduled it for DNA sequencing.
Thanks,
Naomi (working with RET)

An omitted non-symbiotic African Amanita:
By: R. E. Tulloss (ret)
2015-04-05 16:23:07 CDT (-0500)

http://www.amanitaceae.org?Amanita%20aureofloccosa

This species would be strongly yellow.

Very best,

Rod

photos
By: L G Price (LG_Price)
2015-04-05 11:51:40 CDT (-0500)

I am enjoying seeing these photos. A suggestion would be to lighten them up a bit with software such as Photoshop Elements, particularly if there is a lighten shadows. A little bit of exposure increase and a little bit of lighten shadows might make them better balanced. Film cameras did this by nature. With digital cameras, the images could usually use a bit of tweeking.

Suggestion.
By: R. E. Tulloss (ret)
2015-04-05 10:25:39 CDT (-0500)

I would not eat this species. Some of the taxa in subsection Vittadiniae have been shown to contain amino acids that are toxic to humans and can cause serious damage to kidney and/or liver.

If you have a chance to get dried material, I’d be very interested in seeing part of it for my study.

Very best,

Rod

Here is a list of South African species of Amanita that are probably NOT
By: R. E. Tulloss (ret)
2015-04-05 10:20:23 CDT (-0500)

symbiotic with trees and possibly could live on grass clippings in a lawn.

http://www.amanitacea.org?Amanita%20foetidissima
http://www.amanitacea.org?Amanita%20pleuropus
http://www.amanitacea.org?Amanita%20praeclara
http://www.amanitacea.org?Amanita%20roseolescens
http://www.amanitacea.org?Amanita%20veldiei

Some of them can probably be separated from your mushroom based on macroscopic observation.

It might help you a little if you knew the shape of the entire bulb.

I hope that MO participants will let you have a little time to puzzle this one out if you can.

I’ll check back to see what’s happening.

Very best,

Rod

What is the natural gill color? Is the color in the images due to reflection from the grass?
By: R. E. Tulloss (ret)
2015-04-05 10:08:46 CDT (-0500)

This is very likely to be an Amanita. The gill edges are decorated with bits of material that allowed separation from the upper stipe and partial veil. Since amanitas initiall grow as solid lumps (the only gilled mushrooms that have this development mode), they have to developed specialized gill edge cells in order to expand into a mushroom without having parts of their gills left sticking to the stem.

At highest magnification, I can see that the fluffy universal veil on the cap is persistently clinging to the cap surface. This is part of the reason why the volva seems to be breaking up into progressively thinner layers as the cap expands.

Under the classification current on the www.amanitaceae.org website, I think it is likely that this species will have amyloid spores and be assignable to section Lepidella sensu Bas. There are a very small number of species with inamyloid spore (no reaction to iodine in their spore walls) that are somewhat like you species; so I cannot be certain from the photograph alone.

I see that you did not dry a specimen. Is there any possibility of that happening? Of is it possible to get a spore print to test with iodine? Do you have Melzer’s Reagent in your mycological kit?

Very best,

Rod Tulloss

Hello, Liz.
By: R. E. Tulloss (ret)
2015-04-05 09:56:42 CDT (-0500)

Thank you for your email.

Yes, I think this could be an Amanita species.

You describe it as being on a lawn. Can you tell me if there were any trees in the vicinity and, if so, what type(s) of tree(s) it/they were?

There are several amanitas that grow on lawns without an associated woody plant in South Africa. They would all have amyloid spores (turn dark when exposed to iodine) and have powdery or floccose material hanging from the edge of the cap.

Is this the sole specimen that you have seen? Did you see it in earlier stages of growth?

Very best,

Rod

Amanita sp.
By: Liz Popich (Lizzie)
2015-04-05 05:41:09 CDT (-0500)

Could this be an Amanita sp.?

Created: 2015-04-05 05:27:30 CDT (-0500)
Last modified: 2016-12-03 12:59:31 CST (-0600)
Viewed: 139 times, last viewed: 2016-12-06 04:14:59 CST (-0600)
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