Notes:
Growing in mixed woods and sandy soil.
Caps up to 5.5 cm across and thinly striate, ~ 1.1 cm long.
Spore print white and spores amyloid.
Spores ~ 7.0-9.0 X 4.2-5.4 microns, ellipsoid to elongate and smooth.
Q(range) = 1.46-1.68
Q(avg) = 1.61 n=16

Images

Spores in Melzers @ 1000X.

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Comments

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Marginal striations…
By: Dave W (Dave W)
2020-04-09 23:22:53 CDT (-0500)

are perhaps best seen in the last photo (zoom). Looks like the grooves extend beyond 10% of the length of the radius. It would be of interest to know if a younger specimen has a striate cap. If so, this would seem to be a morphological trait in common with the eastern collections of “sp-54”; a trait not typical within section Validae.

Hello, Rod
By: I. G. Safonov (IGSafonov)
2020-04-09 13:51:13 CDT (-0500)

No problem and thank you. Better late than never! :-)
In the course of our recent communication, we identified several collections of umbilicata on MO having their ITS sequences match that of your holotype voucher. The ITS of umblicata is 96.6% similar to that of A. morrisii, whereas the ITS of ‘sp-54’ is only ~94% similar. The phylo-tree I built in GenBank from the BLASTn-500 search of the umbilicata ITS sequence shows this taxon to be related to A. flavoconia and A. morrisii.

Igor.
By: R. E. Tulloss (ret)
2020-04-09 10:47:29 CDT (-0500)

Sorry for being very late in my response to you concerning genetic distance to previous sequences. We never got an LSU sequence of substantial size before. So I can’t compare that. The nrITS sequence

In one case the g.d. is 0.1% due to a missing “T” in a multi-“T” repeat. Not significant.

In the other case the g.d. is 0.1% due to a single mismatch (A/G) in ITS2.

Very best,

Rod

Yes, the photos are a little off
By: Ron Pastorino (Ronpast)
2019-12-25 10:21:41 CST (-0600)

I believe. My notes indicate a brownish center and buff outer edges for the caps. I added another photo that I think is a slightly better representation of the actual colors.

Surprise, indeed
By: I. G. Safonov (IGSafonov)
2019-12-24 17:12:33 CST (-0600)

There are no sequences of umbilicata in GenBank. Out of curiosity, how much of genetic distance is there between umbilicata and “sp-54”, Rod?

Well, here is a surprise.
By: R. E. Tulloss (ret)
2019-12-24 17:04:34 CST (-0600)

The DNA is a near perfect match to that of Amanitasp-54.” At top magnification, I can see bright yellow flakes of volva on the stipe base in at least one of the pictures. The fact that the caps are not distinctly virgate could be due to lighting. Perhaps?

The sequence was over 1740 characters long and includes the complete barcode region as well as the first 1000 or so characters of nrLSU.

The one difference with the closest sp-54 sequence was a difference of one character in the length of a multi-“T” repeat.

Very best,

Rod

The voucher material for this observation has been accessioned in the Roosevelt herbarium.
By: R. E. Tulloss (ret)
2019-07-25 11:09:53 CDT (-0500)

We expect that your material will be sampled for sequencing within 48 hours.

Thank you very much.

Rod

Ron,
By: I. G. Safonov (IGSafonov)
2019-06-29 10:20:42 CDT (-0500)

In addition to the holotype, Rod actually has four more collections of suspected umbilicata, all from me (see MO observations). Even though they have RET accession numbers, for some reason they are not listed in his herbarium.

Rod agrees with you Igor
By: Ron Pastorino (Ronpast)
2019-06-29 09:44:50 CDT (-0500)

He is going to look at it. Thanks.

Ron,
By: I. G. Safonov (IGSafonov)
2019-06-28 21:21:53 CDT (-0500)

This reminds me of A. umbilicata that so far has only been found in the NJ Pine Barrens. The striate cap margin, the yellow crumbly volva at the base of stipe and the spore size and shape of your collection fit the bill.