Agaricoid approaching secotioid, round cap, contorted free gills, partial veil that hasn’t ruptured despite evident maturity, slightly clavate stipe that is orange-brown where eaten by larvae, almond odor.

The gills do not fill the cavity leaving a void that is not present in A. deserticola. Also this obs has distinct cap context and partial veil whereas A. deserticola lacks both. See:

On ground by the side of a gravel road next to wood twigs and piles of needle litter (looked to be pine needles) that were probably dumped at the site as there were no trees in the vicinity. Elevation about 4500’.

Shares characteristics of hybrids like Agaricus sp. ‘hybrid’ RWK_2021 and

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Distinct void in the cavity
Distinct partial veil and cap context
KOH yellow
KOH on right side of cap and stem. A+A on left side of cap.

Proposed Names

57% (1)
Used references: “Agaricus of North America”, Richard W. Kerrigan
Based on chemical features: KOH yellow and A+A orange

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= Observer’s choice
= Current consensus


Add Comment
Nice data
By: Rick Kerrigan (rwkerrigan)
2018-10-23 07:32:03 CST (+0800)

When the observation above was updated, all of the points of distinction between this collection and the concept of a similar taxon were elaborated. That is the type of analysis that can seriously interest an expert in a particular collection. Nice.

A. deserticola is the only described N.A. secotioid (in the longuloid lineage) that has an annular zone of dehiscence between the vestigal pileus margin and the stipe. Will this become a second one? (Other related species open via radial/vertical fissures.) Or will it have different relationships?

Seems closest to…
By: Rick Kerrigan (rwkerrigan)
2018-10-22 10:42:46 CST (+0800)

A. deserticola. Too high up? Worth sequencing.

Created: 2018-10-22 06:01:56 CST (+0800)
Last modified: 2018-12-01 06:21:21 CST (+0800)
Viewed: 48 times, last viewed: 2019-06-30 04:52:14 CST (+0800)
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