Observation 169053: Amanita crenulata Peck

When: 2014-07-03

Collection location: Larksville, Pennsylvania, USA [Click for map]

Who: Phil Yeager (gunchky)

No specimen available

Terrestrial near Black Birch And Oak,but was closest to a large wild Black Cherry. Photo number one appears to show yellow floccose UV remnants at the top of the basal bulb. Picked on a humid day two days after a light rainfall. Pileus diameters were 29-45 mm x 10-20 mm thick. Colors when picked were yellow to light orange, and the caps were convex to applanate with a decurved margin that on some appeared to be toothed, and there were very faint striations on some margins that were approximately 1/4-3/8" long, but they were very faint on older specimens. Caps were slightly tacky and the scales were yellowish-white, dull and dry. No odor or taste discernible. Context was white with some light yellow under the pilepellis, and tspered gradually to the margin , but did not quite reach it. Lamellae were white to yellow en masse, whitish in side view, and some were forked near the stipe. Gills must have been attached on some because there were seceeding lines at the apex. there were four different lenghts of lamellulae, and the gills were close and subcrowded.
Stipe were 50-55 mm long, 8-9 mm at midstipe, with a bulb lenght 10-15 mm x 18-21 mm wide, and stained very light orange. The interior of the bulb had orangish stains in the larval holes. Light brown rhizomorphs were present at the bas of the bulb. There was a superior yellowish-white annulus that became evanescent in older specimens. Stipe context was white and stuffed to hollow


Proposed Names

-26% (3)
Used references: Jenkins
43% (3)
Recognized by sight

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Add Comment
The two trees that appear to be associated with albocreata are Hemlock and Balsam Fir.
By: R. E. Tulloss (ret)
2014-07-08 14:25:55 PDT (-0700)


I am
By: Phil Yeager (gunchky)
2014-07-08 12:50:04 PDT (-0700)

destroying photo 6 and voting for A. crenulata for the rest .

By: Phil Yeager (gunchky)
2014-07-08 12:44:42 PDT (-0700)

You are correct. Photo number6 was taken under Virginia Pine, about 50 yards from where the others were found. Can you tell me if that is hair cap moss where it is growing? Thanks.

By: Phil Yeager (gunchky)
2014-07-08 12:34:32 PDT (-0700)

Good to hear from you. As usual, your comments and opinions are greatfully welcomed. The area where I pick has no Hemlock whatsoever. Would that rule out A. albocreata?

I have seen muscaria var. guessowii in May in a period of heavy rain.
By: R. E. Tulloss (ret)
2014-07-07 06:05:40 PDT (-0700)

I understand what you mean, Eric.

Very best,


Crenulata in July
By: Eric Smith (esmith)
2014-07-07 05:42:20 PDT (-0700)

is unusual but not unheard of…Both Dave W and I have collected it before the fourth and I even have a couple observations made in June. It’s around this time that I sometimes see a “mini flush” of crenulata and muscaria, which are both more common in the fall.

The 6th pic is slightly overexposed. When I zoom in, I see not a whitish cap, but a pale yellow cap, though it does have a darker disc. It also looks like that photo was taken in a different area than the others.

Yes, that’s right, 6th from the top.
By: R. E. Tulloss (ret)
2014-07-06 19:46:38 PDT (-0700)

I agree about predominant association of crenulata with conifers; however, I have found it in a deciduous forest dominated by oak in eastern Massachusetts…many years ago near the site of the Thoreau’s reconstructed cabin near Walden Pond.


The ones seen here with annulus…
By: Dave W (Dave W)
2014-07-06 19:22:19 PDT (-0700)

would rule out albocreata, at least for these particular specimens. 6th photo from the top may be a different type, which is the one I believe you mean, Rod.

I have another idea for the 6th one. It appears to be a very small specimen and another even smaller one appears to be growing close by. Maybe sp 34?

Last year I made collections that matched very well with A. crenulata, beginning on 7-3. For example obs 138808 . These came from under conifers, which is usually where I find crenulata. During the past several years the numbers of crenulata seem to be increasing. I believe I have occasionally collected it from under hardwoods.

I thought about suggesting A. praecox, except the UV material on the caps seems to be distributed in smaller more numerous patches than what I expect with praecox.

How about Amanita spS01 (maybe only for the 6th photo)? http://www.tullabs.com/amanita/?Amanita+sp-S01

Considering the date of the date of the observation…
By: R. E. Tulloss (ret)
2014-07-05 18:48:10 PDT (-0700)

the white cap with a yellow center might be A. albocreata if it was found with hemlock (Tsuga canadensis); however, that should have distinct marginal striations. It is very unusual to find crenulata in July although I do see the pale tan volva on the top of the bulb.

I think there is more than one species in this group of photographs.

Very best,


Created: 2014-07-04 17:39:56 PDT (-0700)
Last modified: 2014-10-21 07:00:30 PDT (-0700)
Viewed: 99 times, last viewed: 2019-07-14 23:54:28 PDT (-0700)
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