When: 2017-08-10

Collection location: Ketchum, Idaho, USA [Click for map]

Who: MushroomNut

No specimen available

I still have a dried specimen that I found last year. I found another agaricus in the same spot just today, but it is much different and smells of phenol and I believe it to possibly be agaricus xanthodermus. As I result, I am beginning to doubt my find from last year being crocodilinus. Please check out the photo below and tell me what you think. Dried specimen (of which I don’t have a photo to post here) is deeply red/orange on the stem and did not smell badly, at least not in the way this new mushroom I found today did (the one I believe to be xathodermus).


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mature spores and DNA would tell the tale.
By: Debbie Viess (amanitarita)
2019-10-09 09:51:18 PDT (-0700)

cap cracking can happen in many Agaricus species.

you were right in doubting this initial ID.

Here is…
By: I. G. Safonov (IGSafonov)
2017-08-10 15:24:22 PDT (-0700)

…a crocodilinus from NJ, confirmed by DNA sequencing – obs 255130. Doesn’t look like anything in this observation, which adds to the confusion and difficulty in identification of this species. See Dr. Kerrigan’s comments therein that address the cap ornamentation.

If no one volunteers
By: Alan Rockefeller (Alan Rockefeller)
2017-08-10 14:06:16 PDT (-0700)

Alvalab.es can be paid to do microscopy, not sure what they charge. Probably very little for a simple size check. However this one might be too young to have mature spores. Might depend on how much it matured before/as it was drying.

I would volunteer if I wasn’t traveling for the next several months.

Check spores
By: MushroomNut
2017-08-10 13:57:46 PDT (-0700)

Is there someone I could send this specimen to from last year to see if it is crocodilinus? I don’t have a microscope. I realize it might not be crocodilinus.

The cap surface is variable
By: Alan Rockefeller (Alan Rockefeller)
2017-08-10 13:47:57 PDT (-0700)

Lots of species of Agaricus can have a crocadile-like pileus surface if it dries out as it is expanding. A. crocodilinus has a tendency to do this more than some species, but it can also have a smooth cap, depending on weather conditions. DNA sequencing is best used to ID A. crocodilinus, but microscopy helps too, as the spores of this taxon are unusually large for Agaricus.

“Crocodile” surface
By: MushroomNut
2017-08-10 13:42:37 PDT (-0700)

The one comment I wanted to make about my photos of this species is that the crocodile like surface was showing on this mushroom before the veil opened to expose the gills. The gills also were not noticably pink when it did open.

I believe this is different than the agaricus I found today (August 10, 2017) in the same spot. It smells badly, and is about 6 inches across, gills exposed and dark chocolate brown, and has a crumbly, crusty top. The mushroom itself is very spongy and has an overall light yellowish appearance on the cap and stem.

Created: 2017-08-10 13:34:40 PDT (-0700)
Last modified: 2019-10-09 09:51:19 PDT (-0700)
Viewed: 55 times, last viewed: 2019-12-04 09:50:26 PST (-0800)
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