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Old Aug 3, 2011, 8:00 pm   #1
zack
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Name: zack
Southern, Michigan USA
Ann Arbor
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Trying to identify mystery agaricus

Found about a dozen of these clustered in a small area today in SE michigan. growing in a primarily oak forest, near where i usually find chanterelles. Picked a couple for identification purposes.

Photos to follow soon...

Description: I'm assuming it's Agaricus, due to spore print color, general shape, but it's possible i'm mistaken. It's definitely not a cortinarius or amanita.

Spore print: chocolate brown

odor: sweet, kind of anise-almond like(I am unable to pick out "phenolic odor", but i don't really know what that is, so i can't say for sure if it's there or not)

stalk: ~1/2 inch thick, mushrooms 4-6 inches tall. White. smooth, with thick cottony partial veil leaving well defined annulus, base of stalk discolors yellow rapidly when bruised, almost hollow(some cobwebby material inside hollow center)

Cap: white, buttons a little over 1 inch, opening to 4-6 inches across, smooth, slightly "marshmallow shaped" when young, flat at maturity, and turning/staining streaky reddish/brown in old age.

Gills: free, close, very thin. starting out white/pinkish, turning pink-brown with age

notes: I'm not particularly familiar with agaricus, so would appreciate a little help on this one... Trying to answer the pertinent id questions, but lack of familiarity with the genus is hindering my efforts. The cap doesn't seem to bruise yellow when rubbed(did bruise darker, but only a slight brown), but did discolor slightly yellow under bleach(sorry, no koh available, closest thing i've got, possible "latent lutescence"?)

Any ideas from experienced agaricus hunters?
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Old Aug 3, 2011, 9:35 pm   #2
zack
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Re: Trying to identify mystery agaricus

http://i42.photobucket.com/albums/e3...w/P1040139.jpg
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Old Aug 4, 2011, 9:22 am   #3
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Re: Trying to identify mystery agaricus

That is a great description Zach. I'm going to have to default to the more experienced also but gives me something to work on. I am impressed with that write up, well done.
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Old Aug 4, 2011, 8:22 pm   #4
zack
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Re: Trying to identify mystery agaricus

Thanks, any help is appreciated.

Found some different ones today too. Looks like another Agaricus. Huge! I'm really hoping this one's edible, as there's about 10 of 'em close together, maybe a couple pounds!

Description:

found in grassy lawn. Close to a foot tall, caps apx 8 inches across at maturity.

Stalk: hollow, 1 inch across, slightly thicker at base. smooth, with small area of fibrous roughness below annulus. light brown, flesh white, bruising brown to red, no yellowing observed. annulus, about 1/8inch thick, sheathlike. Several of the mushrooms had stalks that were split down the sides in a couple places

Cap: round when young, nearly flat at maturity, background white, covered in light brown fibrils and small scales.

Gills: white to slightly pink when young.

Odor: sweet, slightly almondy, not picking up any particular anise smell.

Having trouble getting pics to upload, hopefully soon...
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Old Aug 4, 2011, 8:26 pm   #5
zack
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Re: Trying to identify mystery agaricus

1 pic of the new one:
http://i42.photobucket.com/albums/e3...w/P1040142.jpg
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Old Aug 4, 2011, 9:48 pm   #6
zack
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Re: Trying to identify mystery agaricus

Bad news on the new one. Green spores! clorophyllum molybdites. Beautiful mushroom, but not edible... Surprising the similarities with agaricus. Easy to make the mistake without a spore print.

Pays to get a spore print! Be careful out there fellow shroomers.
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Old Aug 7, 2011, 7:44 pm   #7
SWMichRealtor
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Re: Trying to identify mystery agaricus

I think there's a lot of yellow in your picture. With your description, and where you found it (in the oak woods), I would guess either agricus xanthoderma or agaricus silvicola. A. silvicola is what I call the "Woodhorse." They get very large, but they are not as substantial as horse or meadow agaricus.

I would love Miker's opinion on this.

That's my guess. I saw a hillside of woodhorses today and wished like hell they were edible.

Ed

Last edited by SWMichRealtor; Aug 7, 2011 at 7:45 pm. Reason: adding information
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Old Aug 14, 2011, 11:40 am   #8
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Re: Trying to identify mystery agaricus

Good call Ed, that is the woodhorse, don't bother eating them zack, they have little cap flesh and the stem is chewy,mike
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Old Aug 17, 2011, 1:21 am   #9
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Re: Trying to identify mystery agaricus

.:
Originally Posted by SWMichRealtor View Post
I think there's a lot of yellow in your picture. With your description, and where you found it (in the oak woods), I would guess either agricus xanthoderma or agaricus silvicola. A. silvicola is what I call the "Woodhorse." They get very large, but they are not as substantial as horse or meadow agaricus.

I would love Miker's opinion on this.

That's my guess. I saw a hillside of woodhorses today and wished like hell they were edible.

Ed
If I read it correctly, xanthoderma are native to the Pacific NW and would not be found in a MI yard....I agree with Miker that they are Woodhorse.
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