Observation 63744: Amanita novinupta Tulloss & J. Lindgr.

When: 2011-02-20

Collection location: Dish Area, Stanford University, Stanford, California, USA [Click for map]

37.419572° -122.172047°

Who: Len (placeport)

No specimen available

Solitary, growing under Coast Live Oak.



Proposed Names

-4% (3)
Recognized by sight
44% (3)
Recognized by sight: Stains red and lacks saccate volva

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Yep – in Santa Cruz and areas south
By: Christian (Christian Schwarz)
2011-02-28 20:17:45 PST (-0800)

Almost all of the A. ocreata I’ve seen in Santa Cruz this year have had pink coloration at the disc, (and more than 50% have had a thin calyptra of UV tissue.)

A majority of the A. ocreata at the San Diego fair had pink tones, and maybe Noah can chime in about L.A?

pink a common color in ocreata???! not in my neck of the woods.
By: Debbie Viess (amanitarita)
2011-02-28 19:55:50 PST (-0800)

I have seen exactly one (at the BCCER foray) in fifteen years of looking hard at every amanita I came across. Darvin has a regular patch of pink-caps in Sebastopol as well, but that is just one individual fungus, I assume.

Do you have an area in the south where you commonly see them, Christian?

I also found a beautiful, pink toned A. bisporigera in the SE at the NAMA Pipestem foray (well, actually along the Appalachian Trail at a pre-foray walk with Coleman McC.) They are apparently also uncommon there, although Bill Roody had seen them before.

Agree on all points except
By: Christian (Christian Schwarz)
2011-02-28 12:11:10 PST (-0800)

I would say that A. ocreata shows pink rather commonly, although it may be that one form (species?!) is more frequent in some areas than the other.

novinupta starts out pure white…
By: Debbie Viess (amanitarita)
2011-02-28 11:39:40 PST (-0800)

and develops its red color over time.

ocreata has a bulbous base covered by a thin, membranous universal veil or sac.
Rare forms can show a pinkish-salmon color in the center, but the swollen base with a membranous volva tells it from novinupta (and velosa).
Unlike novinupta, ocreata does not show warts on the cap. If you slice it in half, ocreata will be solid white or show discrete chambers.

Novinupta has a swollen and slightly pointed base that either lacks a visible volva or sometimes shows a close cup (similar to a pantherina, but never rolled at the edge).
Both species show an apical annulus (a skirt high up on the stipe).

Could not confirm color changes
By: Len (placeport)
2011-02-28 09:10:32 PST (-0800)

By the time I got around to it, the specimen had deteriorated too much to test for blushing color changes. Debbie Veiss posted a nice set of drawings of A. novinupta showing diverse forms that may be observed in our area. It is on the BAMS Yahoo Group site, at file: “http://groups.yahoo.com/...; You may need to join the group to view the image. This specimen falls within the range of some of her observations, but is less a bit less rosy than any of them.

Make a cross section
By: Byrain
2011-02-22 15:03:46 PST (-0800)

I recently had some A. novinupta on hand and the inside of the mushroom turned quite red when I made a cross section.

Maybe we can see…
By: Len (placeport)
2011-02-22 14:28:50 PST (-0800)

Thanks for the suggestions. I still have it in the cooler and I think it’s still viable. I’ll slice it lengthwise and rub it a bit to see what happens. Will report back if I find anything.

Distinguishing features
By: Byrain
2011-02-22 13:26:17 PST (-0800)

The indistinct basal bulb as opposed to a sac-like volva and the blushing on the cap I believe. Playing around with it a bit more would of given away the blushing a lot more I would think.

What features distinguish?
By: Len (placeport)
2011-02-22 00:41:49 PST (-0800)

What features distinguish this specimen as Amanita novinupta vs. Amanita ocreata? The smooth, almost featureless white cap of this specimen differed from Amanita novinupta that I observed near this area previously. Compare this to observation http://mushroomobserver.org/61759 and note the prominent scaly remnants of the universal veil on the cap of the latter. Is the shape of the skirt-like ring a distinctive feature? Or is it the slight tint of ochre in the spots on the cap?

Created: 2011-02-21 10:34:07 PST (-0800)
Last modified: 2011-02-28 13:58:15 PST (-0800)
Viewed: 168 times, last viewed: 2018-06-09 15:30:02 PDT (-0700)
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