Observation 443942: Amanita constricta group

When: 2020-12-31

Collection location: Jackson Demonstration State Forest, Mendocino Co., California, USA [Click for map]

Who: Pgrunow

No specimen available

Volva: well-developed but fragile cup, and came off or apart when mushroom was picked (there were no young/developing fruitbodies, others appeared as least as old as the specimen pictured, or older). Slowly weakly staining light to medium brown. It seems rather large and is very rounded at the base of the cup.
Caps: lighten just a bit in age, but basically remain the same. Each one had a small patch of veil remaining. The veil patch on the cap did not bruise and was sticky, with the same consistency as noticed with many Amanitas. The cap itself is dry (except for a rotted one in situ). Caps sometimes had a gentle rounded umbo, but this may not be too apparent from the photos.
Habitat: primarily redwood, Douglas-fir, tanoak, possibly some hemlock; in thick soil, but near a dirt road
Odor: weak, fungal and indstinct, not unpleasant when fresh (edit: fishy and unpleasant in age)
Stipe: no annulus noted; slightly narrower at apex; hollow and unbruising, but white scales rubbed off easily (see in photo) (edit: a couple of minor brown marks have developed from handling or aging, but very little)
these soft, small white “scales” originally covered the stipe.
Taste: mild

KOH to be done
Photos are of specimen the next day.


volva cup

Proposed Names

29% (1)
Recognized by sight: To me, A. pachycolea generally seems darker and shinier with a thicker volva, and I don’t think this fits that species too great, but I could be wrong.
The fruitbodies in general remind me of A. constricta, and the volva has a very slight inward bend partway up the sides, but not sure if any of the volvas were “constricted” enough.
A. castellae can probably be eliminated based upon the ringless cap. While similar in many regards, A. crassiputamen is said to have a faint fruit odor and a cap that slowly bruises light brownish pink. Neither of these features are the case (see cap photo), though I don’t know how variable they area. A lindgreniana is a dark mushroom that I think has always been recorded with pine or spruce around, neither of which were present. A. constrictisorora is more or less identical to constricta, but has only been found to date with Quercus.
Mushrooms of the Redwood Coast mentions two forms of constricta in California; if this is the case, and the mushroom falls within this group, it would be the taller, conifer form
Used references: Amanitaceae.org, Mushrooms of the redwood coast
57% (1)
Recognized by sight
Used references: details tba
Based on microscopic features

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Add Comment
Happy new year, Rod!!!
By: Pgrunow
2021-01-01 19:49:38 CST (-0600)
Looking forward to more… Happy New Year.
By: R. E. Tulloss (ret)
2021-01-01 08:16:08 CST (-0600)