Observation 174500: Amanita umbilicata Tulloss, Hughes, Kudzma & Safonov nom. prov.

> A single specimen collected at an unknown location in FPP by J. or N. Burghardt.
> The mushroom is 8 cm tall, with the cap of 4.2 cm in diameter.
> Not sure if the yellow piece of volval material stuck to the stipe belongs to this mushroom.
> The annulus didn’t have the colors commonly seen in A. morrisii.

Amyloid in Melzer’s reagent;
[20/1/1]: L x W = 8.1-9.8 (-10.7) x (5.1-) 5.3-6.7 μm;
L’ x W’ = 9.1 × 5.8 μm;
Q = (1.37-) 1.42-1.67 (-1.68); Q’ = 1.57; about 1/3 of the measure spores were “low range elongate” (Q = 1.60-1.68) and the rest were ellipsoid

In my experience, ellipsoid and broadly ellipsoid white spores are a pain in your know where to measure, especially if they are inamyloid, as focusing on a transparent and thin-walled object with the refraction ring interference becomes a growing annoyance. Furthermore, for some reason, very few spores of such a shape like to orientate themselves in the desirable lateral view with the apiculus visible (see pix). The next best alternative is a lateral view with the apiculus down, which can only be assessed once the true spore shape is recognized. This unfortunately eliminates the randomness of measurements. I frequently catch myself fishing for larger spores because their shape is less ambiguous. Smaller spores can tilt themselves and look more globose (while still appearing in focus on both ends) than they actually are, skewing your measurements.


Mounted in Melzer’s and visualized at x1000; 1 div = 0.465 μm

Proposed Names

-31% (3)
Recognized by sight
82% (1)
Based on chemical features: Previously, umbilicata was represented only by

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
you’re dead on for obs 175243
By: R. E. Tulloss (ret)
2017-12-18 18:21:21 CST (-0500)

It is RET 647-6 in our herbarium. It is also in the second shipment form Dr. Kudzma. And the nrITS matches to that for umbilicata. I’ll report that in the right place when we’ve also checked the nrLSU, which looks like it will be a little storter than the one from this collection.


Awesome, Rod
By: I. G. Safonov (IGSafonov)
2017-12-18 15:04:53 CST (-0500)

I am very glad you have put a name on this critter. For other examples of what could be this taxon from the Pine Barrens regions of NJ, see:
obs 141696: in RET’s Herbarium
obs 172357: not saved; spore measurements provided
obs 175241: not saved
obs 175243: in RET’s Herbarium; spore measurements provided; scheduled for sequencing
obs 179834: in RET’s Herbarium; spore measurements provided; scheduled for sequencing
obs 290361: in RET’s Herbarium; spore measurements provided

Both the collections of this species found so far are from…
By: R. E. Tulloss (ret)
2017-12-18 14:02:14 CST (-0500)

the Franklin Parker Preserve in Burlington County, New Jersey.

That place is a treasure trove for many genera including Amanita.

Very best,


In our latest data shipment from Dr. Kudzma, we have an nrITS that matches…
By: R. E. Tulloss (ret)
2017-12-18 14:00:03 CST (-0500)

Dr. Hughes nrITS (proposed fungal barcode) sequence from A. umbilicata with one character different and the apparent insertion of an ambiguous character position. Nothing else is very close at all. For the first time, we have a very good nrLSU sequences for this species also (1452 characters long). We are still in the progress of seeing if we can link the left hand end (beginning) fragment of the nuclear ribosomal Large subunit gene to the other (large) segment of the gene that has been derived this time. A further report on progress will be provided.

For those following the progress of the tutorial article for citizen scientists and other students regarding annotation of the nrITS gene, it looks as though we have another odd variant of the left hand end of nrLSU in Amanita to be contributed by the present collection of the present species.

From what we know of umbilicata, the center of the cap is flattened or umbilicate. It may be somewhat distantly related to A. flavoconia.


Very best,


Thanks Igor,
By: groundhog
2014-10-14 12:23:51 CDT (-0400)

This material has been received and accessioned to Rod’s herbarium. We have scheduled it for DNA sequencing.

Created: 2014-08-18 23:13:57 CDT (-0400)
Last modified: 2018-01-05 10:59:09 CST (-0500)
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