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Observation 12002: Amanita sect. Amanita

When: 2008-10-05

Collection location: Larch Mountain, Multnomah Co., Oregon, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

In Aurora’s Mushrooms Demystified, this small yellowish-tinted white Amanita without a yellow annulus keys out nicely to A. citrina, even though Aurora states it is rare on the West Coast. I have found it at lower elevations on Larch Mountain as well, always associated with Douglas fir.


Proposed Names

19% (3)
Recognized by sight: assuming that species even occurs in OR (Rod has me a bit twitchy over some of these old and commonly used names); certainly a member of section amanita (like muscaria, gemmmata, etc) rather than section phalloides (like citrina). yep, they both have yellowish caps, but citrina has a bulbous base with a saccate volva; “gemmata” has a close cup. which does YOUR photo show??!
It’s important to look at ALL of the features of the mushroom in hand, then make your best fit. and even then, sometimes we get it wrong…
56% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
yes, we’ve gone back and forth on this.
By: Debbie Viess (amanitarita)
2011-12-17 04:54:32 CST (+0800)

we are aware that the group needs work.

In the group, yes.
By: Dimitar Bojantchev (dimitar)
2011-12-17 01:43:41 CST (+0800)

What we refer to as “Amanita gemmata” is one of several species in that not-so-tight clade. I would suggest the utilization of A. gemmata gr. as more informative of what we know and not know.


looks like a pretty typical cupulate volva.
By: Debbie Viess (amanitarita)
2011-12-16 02:56:52 CST (+0800)
Cupulate. Yes.
By: Daniel B. Wheeler (Tuberale)
2011-12-16 00:35:36 CST (+0800)

I’d go with that.

For some reason I have a hard time keying out gilled (killed?) mushrooms. Features others have no problem identifying are unseen to me.

This does indeed look like a sake cup on the bottom. I was concerned when digging it up, that I had somehow eroded a portion of the volva away, and lost it in the dirt. In other words, was this the remnant or the true cup?

many words for the same structure.
By: Debbie Viess (amanitarita)
2008-10-06 09:00:25 CST (+0800)

cupulate rather than sacculate. like a sake cup clasping the bottom. the collar is the finished edge of the top of the volva. sometimes rolled, like a sock. aaagh! another term!

Uh … cup-like?
By: Daniel B. Wheeler (Tuberale)
2008-10-06 02:54:47 CST (+0800)

Yep. Aurora uses the term “collar-like” instead of cup-like. In fact, that’s the first couplet in his key: sac-like vs. collar-like. Finally, under couplet 22: “Cap pale-green (nope) to pale yellow (yep) to nearly whitish (yep) with thin grayish, whitish-buff (yep), or pinkish to lavender-gray warts (which may wash off); cap margin not striate; stalk with an abrupt, soft rounded bulb at base; (odd term for cup-like volva – soft rounded bulb?); spores amyloid; common in eastern North America (especially under hardwoods) but also with conifers (yep).” Had I not dug down some 3 inches into the duff with my fingers, gently loosening the stalk, might well have been “bulb” like, as the cup would have been eroded quickly away.

another way to differentiate those two groups of amanita…
By: Debbie Viess (amanitarita)
2008-10-05 23:49:26 CST (+0800)

…if you test spores with Meltzers, section amanita will be inamyloid; phalloides will turn blue. and to answer your next anticipated question, there is a version of gemmata that is exannulate.