Observation 96641: Amanita onusta (Howe) Sacc.

Sample is drying, along with a smaller one.

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Proposed Names

25% (3)
Recognized by sight
46% (2)
Recognized by sight: very similar to cinereoconia, but with dark, semi-pyrimidal warts on cap.
IF cinereoconia, cut flesh should turn orange.
57% (3)
Recognized by sight: Notice the recurved scales at the base of the stipe – A. cinneroconia does not have such scales

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Cartridge tape boxes
By: R. E. Tulloss (ret)
2012-06-20 10:11:28 CDT (-0500)

Sounds like a good idea, Patrick.


Re Padded envelopes
By: Patrick Harvey (pg_harvey)
2012-06-20 09:45:14 CDT (-0500)

I’ll keep that in mind — I can get some unused cartridge tape boxes at
work that should prevent that problem.

Thank you.
By: R. E. Tulloss (ret)
2012-06-20 09:29:32 CDT (-0500)

Material has arrived in Roosevelt.

Unfortunately, it got busted up in the postal service (this is a shortcoming of padded bags), but we’ll find spores.

We’re cataloging it today.


your experience with these yellowing leps…
By: Debbie Viess (amanitarita)
2012-06-09 10:13:33 CDT (-0500)

far exceeds mine. I have never seen one get to the orange stage, nor exude orange droplets! Wild.

Your below link to “yellowing disease” in subsolitaria didn’t work (spelling error).

This one did:


Thanks again Rod. I will be curious to see what this lep turns out to be. Seems as though it is betwix and between a couple of similar species.

Lepidella ID keeps us humble! ;)

It’s a question of intensity…[edit: link corrected]
By: R. E. Tulloss (ret)
2012-06-08 17:14:15 CDT (-0500)

You’re welcome.

On particularly abraded/damaged tissue, in older basidiomes, in exuded droplets from cut surfaces, material suffering from what is apparently the yellowing syndrome can be orange as well as yellow. I think it is a question of such things as the age of the basidiome and the “extent of the infection.”

The orange is particularly evident in the photographs on the brief tab for


Amanita subsolitaria is the first amanita in which I saw the yellowing syndrome. I spent the most effort describing the syndrome on that page.


thanks Rod…
By: Debbie Viess (amanitarita)
2012-06-08 13:37:45 CDT (-0500)

I just scrolled down through your old, familiar webpage looking for something distinctive about cinereoconica, and I found it! Never noticed that it was a different variety of that species, though.

I have seen your “yellowing disease” in both eastern and western lepidellas, and “orange staining” sure didn’t sound like it! No matter, since it isn’t applicable in this case, anyway.

4 inches is rather big for onusta, but I have seen them about 3/4 that big…once.
By: R. E. Tulloss (ret)
2012-06-08 13:05:27 CDT (-0500)

Bas’ description of onusta says the cap can be up to 4 inches (100 mm) wide.


By: R. E. Tulloss (ret)
2012-06-08 13:02:31 CDT (-0500)

The quote is from a page entitled “Amanita cinereoconia var. croceescens.” This is the name proposed by Bas for the yellowing material of cinereoconia. If you check out this page:


you won’t find the same statement.

The page you quote from is here:


(hope I spelled it correctly).

You will find a discussion on the plain old (cinereoconia page) that suggests that the yellowing syndrome may be in play when you find a cinereoconia that turns yellow.


not the “yellowing disease.”
By: Debbie Viess (amanitarita)
2012-06-08 10:46:25 CDT (-0500)

Re: Amanita cinereoconia, quoted from your website, Rod: “The flesh is white, changing soon to deep bright orange when cut.” I have never personally collected it, although I have collected onusta (usually small) and cinereopannosa (med-large).

The size stated here by Patrick seems to be too large for onusta, although there is some size overlap. Friable volvar material can look different at different times. Here is a photo of another cinereopannosa here on MO that also seems to show recurved scales:


Let us know what the microscopy shows! It’s not always easy to tell these leps apart…

By: R. E. Tulloss (ret)
2012-06-08 09:44:48 CDT (-0500)

First, thank you for the offer of the material.

Secondly, on the topic of rulers in the collecting basket: One of my daughter-in-laws is an architect and gave me an incredibly flexible, yet sturdy plastic ruler which is apparently made for architects and others who have to measure along curved surfaces. I recommend this ruler highly. The only way to get a relatively reliable view of the ratio of striation length to cap diameter in a cap that has not fully opened is to measure both the striations and the cap diameter with something that flexes over the cap right at the cap’s surface…like string or a strip of paper or a very flexible ruler.


By: Patrick Harvey (pg_harvey)
2012-06-08 09:01:40 CDT (-0500)

I really should throw a ruler in my basket!

The cap was about 4 inches across, total stem length is about 6 inches.
The flash really changes the color — and evening light under the trees
did not help. Gills are whitish to cream color after drying. I’ll send
it on to you tonight.

A couple of questions/comments…
By: R. E. Tulloss (ret)
2012-06-07 23:20:59 CDT (-0500)

Patrick, can you give us an idea of the size of the specimen?

Just a clarification: cinereoconia supposedly has a yellow-staining variety; however, when I collected a specimen of cinereoconia that eventually turned yellow, it did not do so at first. My impression was that at least some material attributable to a yellowing variety of cinereoconia is regular old cinereoconia with the yellowing staining syndrome.

Amanita cinereopannosa is a much larger species than either of the other two (talking average sizes here) and the upper part of the bulb has a tendency to break up into rectangles suggesting a brick wall…as opposed to the scales that Patrick mentions for onusta.

Very best,


as far as I know…
By: Debbie Viess (amanitarita)
2012-06-07 20:14:59 CDT (-0500)

this is west of the known range for cinereopannosa, but it sure looks like it to me.

Created: 2012-06-07 18:55:59 CDT (-0500)
Last modified: 2018-01-01 15:26:33 CST (-0600)
Viewed: 153 times, last viewed: 2018-04-18 19:31:34 CDT (-0500)
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