I attempted to create the MO name “Amanita sect. Vaginatae series Penetratrices”, but the name failed to register after several clicks on “create”.

Series Penetratrices is provisionally characterized as per molecular data . Macro features that may correlate with this subcategory of section Vaginatae include: deeply buried stipe, thick/hard pronounced umbo on the disc, persistent membranous volva, relatively large fruit bodies. These traits are all apparent here.

Stipe base buried over 2 inches in the soil.

Oak-dominated woods.

Spores globose to slightly subglobose, ~8.5-11.5 × 8.5-11.5.

Found within sight of obs 281999, but I think 281999 may be a different species.


Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


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It’s important to recognize the people who are helping you…
By: R. E. Tulloss (ret)
2018-07-21 19:45:57 CDT (-0400)

And to do that again and again.

Very best,


And you still find time…
By: Dave W (Dave W)
2018-07-21 18:35:31 CDT (-0400)

to comment on everyone’s submissions. Thanks :-)

Thanks for the news, David.
By: R. E. Tulloss (ret)
2018-07-21 17:43:53 CDT (-0400)

We’re just about caught up on accessioning. I have to do all the data entry now. Mary is helping with putting labels in packets and organizing the stuff to go into the herbarium. It’s quite a job to catch up on accessioning several hundred collections.

Very best,


Yeah, this one…
By: Dave W (Dave W)
2018-07-21 16:53:24 CDT (-0400)

lacks the strongly zoned cap. The color is more uniform than for what has been recorded as luzernensis; maybe darker on/near the umbo and lighter along the margin but without the marked contrast.

I forayed the luzernensis location yesterday (oak woods at Ricketts Glen), and there was very little happening there. Everything seems to running behind schedule this summer. Hardwood areas are just starting to produce. I’ll get back to this spot once more before next Thursday, at which time I’ll be traveling away from home for awhile. Lots of rain in the near forecast.

The voucher material for this observation has been accessioned in our herbarium.
By: R. E. Tulloss (ret)
2018-07-21 10:51:57 CDT (-0400)

Thank you, again, for another exciting collection in the Vaginatae, David.

Amanita luzernensis has a more pronounced zonate cap in my view…at the moment. We will listen to the DNA. :)

Very best,


I do agree that this could be in the provisional series Penetratrices.
By: R. E. Tulloss (ret)
2017-07-14 21:22:28 CDT (-0400)

So far, the combination of characters pointed out by David W. have all ended up genetically in the provisional series.

Just to get the information on MO, I’d also like to point out that two regional checklists relevant to the observation have recently been updated:

was just posted this evening.

The other has been up for a couple of weeks:

Very best,


Good comments and very nice post. <<< EDITED
By: R. E. Tulloss (ret)
2017-07-14 21:14:17 CDT (-0400)

Thanks, David I would be very interested in examing the dried material especially in terms of comparing it to luzernensis.

Very best,


Cap color is a bit paler…
By: Dave W (Dave W)
2017-07-14 19:20:41 CDT (-0400)

and contrasting bands less dramatic, but otherwise, this seems to resemble obs 169768 in the following ways: cap grayish on the disc and pale along the margin, central umbo small and abrupt, stipe with fine graysih ornamentation, persistent membranous/saccate volva, fruit body large, spores globose. Habitat for this was similar to habitat for 169768, oak dominated woods.

Spore dimensions similar to obs 74501 , a little larger.

This specimen had stipe buried more deeply than 169768.

Well, I think…
By: Dave W (Dave W)
2017-07-13 19:16:25 CDT (-0400)

it’s not a function of intelligence. Probably just MO erecting some obstacles to wild and crazy name creation. (This has occasionally been an issue.) No problem really. Just go with a general ID proposal and say what you want in the Notes. Maybe “series” is not a term MO recognizes as part of a scientific name…?

By: Ryan Patrick (donjonson420)
2017-07-13 18:23:45 CDT (-0400)

I attempted this myself awhile back but couldn’t figure out the naming system to make it fit properly. Hopefully someone smarter could correct this for us.

Created: 2017-07-13 08:34:27 CDT (-0400)
Last modified: 2018-07-21 19:45:58 CDT (-0400)
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