Observation 220735: Amanita frostiana (Peck) Sacc.

When: 2015-09-14

Collection location: Bat Lake Trail, Algonquin Park, Ontario, Canada [Click for map]

Who: walt sturgeon (Mycowalt)

No specimen available

Proposed Names

34% (3)
Recognized by sight
61% (2)
Recognized by sight: Lined margin.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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I don’t think that the variable
By: Debbie Viess (amanitarita)
2017-07-04 10:54:53 PDT (-0700)

of marginal striations is the best way to make this ID.

By: walt sturgeon (Mycowalt)
2015-10-29 12:39:29 PDT (-0700)

did not seem rimmed enough for Amanita frostiana. I did not collect it.

That’s an interesting comparison, Herb.
By: Dave W (Dave W)
2015-10-27 18:03:13 PDT (-0700)

The specimen seen in the linked observation (previous comment) has a basal collar that is less abrupt than frostiana I have found. Actually, I seem to recall some frostiana coming in during NEMF 2014 in Maine that had similar basal volvas.

Walt, given the confidence level of your proposal, I assume you didn’t determine whether the spores are amyloid.

By: Erlon (Herbert Baker)
2015-10-27 11:03:25 PDT (-0700)
By: Dave W (Dave W)
2015-10-27 09:02:32 PDT (-0700)

generally shows a volval collar encircling the stipe base above the bulb.

I think the lines along cap margin, which are fairly indistinct, are the result of age/moisture-content affecting the way the cuticle adheres to the thin context along the cap margin. I have seen this with flavoconia.

Created: 2015-10-26 21:39:02 PDT (-0700)
Last modified: 2017-07-04 12:23:28 PDT (-0700)
Viewed: 102 times, last viewed: 2018-01-15 21:33:14 PST (-0800)
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