Observation 207273: Agaricus L.

When: 2015-06-21

Collection location: Glenridge Quarry Naturalization Site, St. Catharines, Ontario, Canada [Click for map]

Who: SaraJE

No specimen available

In the heritage mixed wood section located on the ground.



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Good Morning
By: SaraJE
2015-06-23 10:14:04 CDT (-0500)

These were found in the woods section. I will send a link of information about the area


insufficient information to make an ID to species.
By: Debbie Viess (amanitarita)
2015-06-23 09:52:41 CDT (-0500)

it does resemble something in section Arvenses. Highly unlikely to be augustus, though, and I have no idea how many other yellowing almondy (assuming that this one actually does yellow and has an almond fragrance) species of Agaricus there are in Ontario. Were these growing in a woods or in disturbed human habitat?

Looks like A. augustus
By: Terri Clements/Donna Fulton (pinonbistro)
2015-06-22 19:33:47 CDT (-0500)

but most experts I’ve read say it is a western species. A. subrufescens does occur east of the Rockies and may be confused with A. augustus. M. Kuo: "Recent investigations support the idea that Agaricus subrufescens is a highly variable species, in both its outward and microscopic features. DNA evidence from Kerrigan (2005) suggests that South America’s Agaricus blazei, as described by many authors, and Agaricus brasiliensis, are genetically identical to Agaricus subrufescens. The original description of Agaricus subrufescens, by Peck (1894), does not note any yellow bruising. However, Kerrigan points out that Peck studied specimens that were several days old, and had been sent to him; the actual collector wrote later that the mushroom had a “lemon tinted neck.” Reports of Agaricus augustus from eastern North America may represent Agaricus subrufescens; it is unclear whether Agaricus augustus actually occurs east of the Rocky Mountains. It, too, has an almond odor and taste, large and blocky stature, and scales. However, it is usually darker brown, tends to have more prominent scales, grows more frequently in woods, and has significantly larger spores (7-10 × 4.5-5.5 µ)."

Good morning
By: SaraJE
2015-06-22 06:00:32 CDT (-0500)

Thanks for the help. I did not smell the mushroom no although I was close when taking photos; it did not seem to have an odor that I noticed at the time.

that marshmallow shape
By: Jacob Kalichman (Pulk)
2015-06-21 21:01:59 CDT (-0500)

is very widespread among Agaricus species. The major feature in this that reminded me of A. augustus is the cap scale pattern/texture. Your distribution point casts a lot of doubt on that, though. I dunno species well.

The blocky marshmallow shape of the cap
By: Terri Clements/Donna Fulton (pinonbistro)
2015-06-21 20:58:58 CDT (-0500)

and its brown fibrous scales remind me of Agaricus augustus which may not occur east of the Rockies according to what I’ve read. This may be Agaricus subrufescens? Did you smell it?

Created: 2015-06-21 19:20:55 CDT (-0500)
Last modified: 2015-06-23 09:47:47 CDT (-0500)
Viewed: 99 times, last viewed: 2017-06-20 06:29:01 CDT (-0500)
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