Notes: growing in grass along treeless roadside, near coastal shrubs.
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Observation pages are for an individual observation of a mushroom – one finding of a species in one place by (usually) one person. Click “Create Observation” in the navigation bar to post your own photos.
Sorry, I didn’t know how to add a photo of the Agaricus crocodilinus I have. :(
I just found this today in central Idaho, just north of Ketchum under a pine tree. At least I believe that’s what it is. I am doing a spore print on a smaller specimen. Could you please ID from the photo. I would like to try eating this, if it’s possible to get a correct ID from my photos.
I gave my friend some gills from this collection and he was able to get the spores to germinate on peroxide agar.
So I see there are both big and smaller spores here…, Is this a smash mount or spores collected from a drop? Is this croc. atypical? The top looks mature, but the short gills – are they immature? I would think an Agaricus like this one would be making deep spore prints every three hours…, Christian – maybe you should try these under your ’scope! Thanks Deb, this is almost as good as being there!
A few comments from Rick Kerrigan (with permission):
“I don’t think the species [A. crocodilinus] has been confirmed from any further south than from your locality. Regarding spore size, here are my measurements on 280 spores from 13 specimens:
SPORES dark brown, ellipsoid, (8.6-) 9.2-11.2 (-12.8) × (5.8-) 6.2-7.7 (-8.6) um (longer on bisporic basidia) (N=280, C=13).
“Stresses including slow dessication can result in abnormal (including long) spores in many species.”
still no sporedrop, tho. gill smash mount showed many enormous immature spores, some up to 15 micrometers! in water at 1000×.
note absurdly narrow gill width in comparison to context.
note inrolled cap margin, even at age.
since my report of the average sized spores (“only” up to 11 microns) was underwhelming to some, I am in process of getting a spore drop to see if I can’t find some of those super-gigantic spores. my first slide was a mere smash mount, and no doubt had lots of immature spores.
another curious aspect to this Agaricus is that the gills were extremely short…only a third of the length of the cap context! I’ll post that photo today, too.
still rockin’ the croc…;)
Where is the microscopy? The microscopically challenged would love to see these big spores…, How ’bout it Deb? Great find either way!
I’ll check again when I section it for the dryer.
Agaricus crocodilinus ‘var. mutabilis’ Isaacs nom. prov.
Agaricus crocodilinus Murrill var. crocodilinus Mycologia 4: 300. 1912
Which is this?
So I could go and touch it!
Time to reassess, Tim!
Never heard about it or seen such a thing. Rod T. always says about spores varying a lot….. Must say though, that when physically touching mushrooms presents a thrill, one might need to reassess.
“up to 14 microns” is the outer range for giant spores; 8-11 is the norm. this is without a doubt crocodilinus, but I’m sure that Bruns can run the DNA if he so desires.
Come to the May BAMS meeting Erin, and I’ll let you touch it! A little piece of myco-history…;)
Is “up to 11 µm” really a match for “somewhere around 14 µm”?
up to 11 microns in length.
Created: 2011-05-08 23:20:12 EDT (-0400)
Last modified: 2016-09-23 21:22:20 EDT (-0400)
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