Proposed Names

91% (2)
Based on chemical features: nrITS & nrLSU sequences (joined) see comment.

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= Observer’s choice
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Thank you for the comments
By: Adam Bryant (Adam Bryant)
2020-02-15 14:42:44 PST (-0800)

Sure, I’ll keep an eye out for albino pachycolea.

Adam, this is the darkest cap I have ever seen on Amanita castellae.
By: R. E. Tulloss (ret)
2020-02-15 13:34:44 PST (-0800)

So, I don’t know how common this cap color is on castellae. I will add you photo to our page at

There you will see some of the cap colors we have seen in the past.

You are not the first to label a specimen of A. castellae as A. pachycolea.

I have been thinking that the dark ring around the inside of the marginal striations is one thing that suggests to people that they have found a small or a pale pachycolea.

The latter is quite often very tall. It may be tall and thin in some cases (Harry
Thiers sometimes used the name “vaginata” for very thin specimens of pachycolea.

I was able to distinguish pachycolea by microscopy plust field characters in the past. I think your specimen would have given me some trouble (except the volva does seem rather small for pachycolea). Now I would suggest the
proportionately small volva and the orange or orange-brown pigment on the cap.

If you ever see something that looks like an albino pachycolea, I would really like to see it. The only thing I’ve examined that was called an albino pachycolea was castellae. But… There still might be a real albino out there that is the BIG P.

Very best,


Thank you Rod
By: Adam Bryant (Adam Bryant)
2019-09-11 13:14:10 PDT (-0700)

Really interesting! It’s nice to get results like this back on something I sent in, and thank you for the compliments on the photos. Is there any more light you can shed on field traits for distinguishing from pachycolea, including possibly biogeographic?

By: Logan Wiedenfeld (LoganW)
2019-09-07 13:30:11 PDT (-0700)

A stunning mushroom!

Congratulations, Andrew.
By: R. E. Tulloss (ret)
2019-09-07 13:20:25 PDT (-0700)

The images are absolutely striking.

Very best,


We have received raw data for rDNA from the voucher material for this observation.
By: R. E. Tulloss (ret)
2019-09-07 13:17:20 PDT (-0700)

An analysis shows that we submit the latter part of the proposed barcode gene and an attached segment of nrLSU with a total length of 1489 characters to GenBank. The closest BLAST match is to A. castellae (0.2% distant or different in 3 characters in a pairwise comparison). Moreover there are no differences in the first 1,236 characters.

You can compare the morphology with previous photographs here:

I think you will see that the cap color in castellae has a strong orange component in the lighter colored bands of the cap.

Amanita castellae has the unusual beginning of the nrLSU gene that we first noticed in A. penetratrix.

Very best,


Thank you very much for sending the voucher for this observation.
By: R. E. Tulloss (ret)
2018-11-25 08:44:17 PST (-0800)

We have accessioned the specimen in our herbarium and scheduled it for sampling.

It would be a good idea, in future, to put the packet of dessicant outside of the specimen bag. Otherwise it tends to increase damage to the specimen during shipping.

We have a well-preserved specimen in this case.

Thank you.

Very best,


You are very generous.
By: R. E. Tulloss (ret)
2018-10-23 09:10:22 PDT (-0700)

I would be delighted to examine this material.

The photos increase the value of the collection in my opinion.

I will email you my address.

Very best,

Rod Tulloss

No, however…
By: Adam Bryant (Adam Bryant)
2018-10-22 21:42:06 PDT (-0700)

I could send it to you if you’d like.

Beautiful images.
By: R. E. Tulloss (ret)
2018-10-22 13:45:24 PDT (-0700)

Are you planning to get DNA sequenced?

Very best,