Observation 69492: Amanita Pers. sect. Amanita
When: 2011-06-17
No herbarium specimen

Notes: Same 2 square yard area and same general appearance as obs 69014.

http://mushroomobserver.org/69014?q=4rKR

Spore photo is better for this obs. Spores not amyloid.

Grassy path nearby an oak and wild rose bush. Other deciduous trees in the vicinity.

Caps somewhat viscid following rainfall at night. These were collected during the morning. Species is apparently ringless. Some volval material deposited atop basal bulb.

Proposed Names

29% (1)
Used references: See discussion. Amanita Studies site description of A. russuloides seems to come close. Species 34 described as having a ring. No sign of a ring on any specimen in this collection.
56% (1)
Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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I’m glad you posted the little critter.
By: R. E. Tulloss (ret)
2011-12-14 02:50:23 CST (-0500)

R

Any ring would have needed
By: Dave W (Dave W)
2011-12-13 21:20:01 CST (-0500)

to disappear quite quickly, as I found these very freshly emerged specimens (the viscid ones) along a path on my property that I walk regularly. After making this collection, I kept a close watch on this patch, and subsequent fruitings never showed any signs of rings… even with half opened caps. I made similar collections (cap color and warts somewhat variable) in other locations this summer…. never any sign of a ring.

Perhaps the partial volvas are so fragile/transient that they disintegrate before the cap even begins to open?

The ring sp. 34 is transient.
By: R. E. Tulloss (ret)
2011-12-13 20:39:13 CST (-0500)

David, I still feel this is awfully close to sp. 34.

The provisional rank for Amanitella is “subsection.” A gelatinized cap excludes this fellow from subsect. Amanitella becaues that section is partially defined by the pileipellis delaying gelatinization. The prime example around our part of the world is Amanita farinosa.

Rod

Just collected
By: Dave W (Dave W)
2011-06-19 13:17:38 CDT (-0400)

and examined a few more specimens… same fruiting as first 4 pics. This newest collection was not wet/viscid, and the color scheme for the caps had changed a bit.

Specimen 1…
Length of stipe about 1.5(cap diam).
Cap diameter (unexpanded) just under one inch. Ground color of cap faded to a light brassy shade. Striations = s, cap radius = r, 0.35r < s < 0.4r. Warts whitish somewhat crowded at the disc, occasional along margin.
Stipe context creamy whitish and solid along lower 25% including bulb and nearby apex; thin hollow chamber through mid section. Stipe grainy/tomentose just at apex.
Basal bulb somewhat abrupt but smooth along the collar with no volval deposits on collar area.

Specimen 2…
Length of stipe approximately equal to cap diameter.
Cap diameter about one inch. Cap ground color light brassy. s = striations 0.25r < s < 0.4r. Warts whitish to yellowish mostly on the disc, somewhat granular and adhering to the cuticle. Margin tuberculate striate.
Stipe solid in lower third including the bulb, partially stuffed central chamber through upper two thirds. Context creamy whitish.
Basal bulb abrupt but smooth with light yellowish volval deposits on collar area.

These are mature specimens. Last pic shows material from warts in KOH at 400×.

Wondering if these may be the same type as another small ringless type I collected about a week ago… different location.
http://mushroomobserver.org/69128?q=4t26

Species 34.
By: Dave W (Dave W)
2011-06-18 21:31:32 CDT (-0400)

The description of the stipe on the Amanita Studies website mentions an annulus. I’m fairly confident the ones seen in this obs are ringless. Other than that, a lot of what I see in the description sounds good.

It did occur to me that these looked a bit like miniature A. albocreata. But as I nunderstand albocreata, it is a tall stately mushroom with (much of the time) realtively large patches of whitish volval material on the cap. As you say, the upper parts of the basal bulbs on my collections show a smooth collar region.

There’s still a few left growing on the path im my yard. No rainfall expected througb tomorrow afternoon. Hope they’re still fresh enough to examine a few more macro traits. Anything worth looking for under the scope?

thinking about this…
By: R. E. Tulloss (ret)
2011-06-18 18:26:25 CDT (-0400)

I think you are right in not considering Amanita albocreata. The volval material might be described as a limb, it is certainly not the pantherina-like collar that is normal for albocreata. On the other hand the gelatinization of the pileus in subsect. Amanitella is very slow to occur and I’ve never seen the very viscid looking appearance of your caps on (e.g.) A. farinosa.

I think there is another possibility — a very small, gemmata-like taxon:

http://www.amanitaceae.org/?Amanita+sp-34

It has spores that are at least the same shape as those you show in your photograph. In addition, the cap coloring is very similar; the stem is indeed ringless; and the volval material at the same base is like that shown in your photos. I know it from under pin oak in my own yard…as well as in other places.

What do you think?

Very best,

Rod

Created: 2011-06-18 09:29:23 CDT (-0400)
Last modified: 2012-06-06 16:28:06 CDT (-0400)
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