Notes:
Color in photos is accurate. UV deposits on cap surface are grayish. Ornamentation on stipe grayish.

Reminds me somewhat of rhacopus, but I think this is a different species. Basal structure compromised by the activity of the critter seen in second and third photos. Volva appeared to be friable, but how much this was due to the critter is difficult to say.

Spores globose.

Images

Proposed Names

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The voucher material for this observation has been accessioned in our herbarium.
By: R. E. Tulloss (ret)
2018-07-19 07:03:17 PDT (-0700)

I’ve seen something approximating this cap color that was rhacopus. The volval material in xanthocephala is very dark to black. We’ll get DNA and check this out.

Very best,

Rod

This one’s dried…
By: Dave W (Dave W)
2017-07-13 13:30:31 PDT (-0700)

and ready to be labeled/stored.

Habitat here is much different than the Pine Barrens, which makes this more interesting.

Well, this one is worth sequencing I think.
By: R. E. Tulloss (ret)
2017-07-13 11:45:26 PDT (-0700)

David, I also noted the white margin and thought of the character on xanthomitra.

I first found xanthomitra in the NJ pine barrens years ago in Shark River County Park (eastern Monmouth Co.) at a relatively high point. I think I can go to the same spot up hill from picnic area that is nearest the dammed up pond.

If I remember correctly the area has some moderately large rhododendrons and has soil with some small pebbles in it. I’ve collected several species of the Vaginatae within a 30 m of that original collection. It’s a good place when conditions are right.

Very best,

Rod

Yes, I seem to recall…
By: Dave W (Dave W)
2017-07-13 10:38:13 PDT (-0700)

whitish volva material that fell away as the soil was removed form the base. You’re probably correct, Igor, to say the insect had little or nothing to do with the volva.

Dave,
By: I. G. Safonov (IGSafonov)
2017-07-13 10:30:12 PDT (-0700)

I recall that when we collected this mushroom, I carefully removed the moist soil around the volval sack. The UV was composed of naturally friable and loose material and didn’t appear to be compromised by the insect. I think that the UV at the stem base was whitish, unlike the obviously gray warts on the cap.

Thanks Rod.
By: Dave W (Dave W)
2017-07-13 10:17:21 PDT (-0700)

The fairly numerous small warts on the cap is not a trait I’m used to seeing with sinicoflava. Also, once sinicoflava cap expands, there’s usually an umbo.

I don’t know the species xanthomitra. The color of the disc seen here is more drab/muted than what is described on the Amanita Studies website http://www.amanitaceae.org/?Amanita+xanthomitra . But the pale margin is in line with the description. Volva was possibly compromised by insect damage, but appeared to be small, fragile/friable, and mainly whitish. The small crumbs of UV deposit on the cap agree with xanthomirta.

Estimate for the spore dimensions (based on the small sample seen in the photo)… 8-11.5 × 8-11. This is a just below the reported range for xanthomitra, but seemingly significantly smaller than sinicoflava.

I suggest xanthomitra or sinicoflava.
By: R. E. Tulloss (ret)
2017-07-13 08:02:44 PDT (-0700)

R

Created: 2017-07-13 05:02:43 PDT (-0700)
Last modified: 2018-07-19 07:03:19 PDT (-0700)
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