Could this be Agaricus augustus?

Please try to include photos to show all parts of the fungus, eg top, stem, and gills.
Note any smells, and associated trees or plants (eg oak, birch). A spore print can be very useful.
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chriszhang
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Could this be Agaricus augustus?

Post by chriszhang » Sat Oct 13, 2018 4:34 pm

Found in manchester.
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adampembs
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Re: Could this be Agaricus augustus?

Post by adampembs » Sat Oct 13, 2018 5:14 pm

Welcome to UK Fungi. :)
I think not, but I have no idea what it is because you haven't provided enough information on the fungus, especially a photo of the gills and the stem.

Please see viewtopic.php?f=4&t=49

Best wishes,
Adam Pollard
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chriszhang
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Re: Could this be Agaricus augustus?

Post by chriszhang » Sat Oct 13, 2018 6:09 pm

Sorry for lack of detail when posted.
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adampembs
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Re: Could this be Agaricus augustus?

Post by adampembs » Sat Oct 13, 2018 6:41 pm

Thanks.
Any smells?
If could you scratch the stem base and smell it, and wait for colour change, then slice in half lengthways, and watch for reddening or yellowing, and let us know :D
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chriszhang
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Re: Could this be Agaricus augustus?

Post by chriszhang » Sat Oct 13, 2018 7:02 pm

Thank you for the notice Adams!

I've just chopped it off and found the stem base turns to yellow. From Collins, it seems that the yellow base Agaricus with cap up to 15cm can only be A.xanthodermus.

And it is the only species which has " cap finely cracked" in the description.

One thing I don't understand,when describe smell, Collins use "Schaeffer+/-, may I ask what it means?

Thanks!
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adampembs
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Re: Could this be Agaricus augustus?

Post by adampembs » Sat Oct 13, 2018 7:14 pm

chriszhang wrote:
Sat Oct 13, 2018 7:02 pm


One thing I don't understand,when describe smell, Collins use "Schaeffer+/-, may I ask what it means?

Thanks!
I think it is probably A. xanthodermus, as you say. You can get smells of anise, almonds, disinfectant, metallic and so on.
Schaeffer is a chemical test. I don't use it, although I have a few chemicals.
https://en.wikipedia.org/wiki/Chemical_ ... tification
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Re: Could this be Agaricus augustus?

Post by mollisia » Sat Oct 13, 2018 8:38 pm

Hello,

Schaeffer reaction means that you do a line of anilin on the cap surface and crosswise a line of HNO4 and when the crossing point is vivid orange than it is Schaeffer +, when the crossing point is unspectaculaire then it is Schaeffer -

All species of the section Xanthodermatei are Schaeffer negative, but KOH positive (sulphur yellow with KOH 20% on the cap).

Yours is Agaricus xanthoderma, and some would name it var. griseus. I personally don't think that this somewhat scaly fruitbodies are worth to be named as a variety, but are within the normal range of variation.

best regards,
Andreas

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