Observation 32205: Amanita sect. Vaginatae sensu Zhu L. Yang
When: 2009-06-20
No herbarium specimen

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Forgot to mention…
By: R. E. Tulloss (ret)
2010-01-19 21:34:09 EST (-0500)

I’m hoping to have some data on the eastern N. American “var. alba” on the Amanita Studies site sometime in the coming year. Right now, my younger son, David, and I are working on a complete rebuild of the existing site. The new site will have provisional taxa, numbered taxa-that-might-be, taxa sensu this person or that…many more amanitas than we had on line before. So whether its under a provisional name or a number I’m really hoping that we get the N.A. “var. alba” up with at least some of the data that’s lying lonely in my notebooks. Also, we will have a way of posting information about a collection along with (a) photo(s) on-line on the site sometime in the coming months. We also have been linking to MO postings when we have dried material to certify what the mushroom in a picture is (to the best of our knowledge, of course). We plan to continue doing that.

Very best,

R

Forgot to mention…
By: R. E. Tulloss (ret)
2010-01-19 21:33:59 EST (-0500)

I’m hoping to have some data on the eastern N. American “var. alba” on the Amanita Studies site sometime in the coming year. Right now, my younger son, David, and I are working on a complete rebuild of the existing site. The new site will have provisional taxa, numbered, taxa sensu this person or that…many more amanitas than we had on line before. So whether its under a provisional name or a number I’m really hoping that we get the N.A. “var. alba” up with at least some of the data that’s lying lonely in my notebooks. Also, we will have a way of posting information about a collection along with (a) photo(s) on-line on the site sometime in the coming months. We also have been linking to MO postings when we have dried material to certify what the mushroom in a picture is (to the best of our knowledge, of course). We plan to continue doing that.

Very best,

R

material always welcome and…
By: R. E. Tulloss (ret)
2010-01-19 21:23:40 EST (-0500)

Bob,

Thanks for the thanks. I’m glad to hear that you’d be willing to send dried material next year. Good quality collections are better than lots of collections with little additional information. On the Amanita Studies site, there is a portion of the home page near the very bottom labeled “Methodology for Mophological Studies.” In that section there are some blank forms for collecting notes. There are two examples of the notes filled out…as it happens one of the examples is for a species of sect. Vaginatae. You may find the blank and the sample helpful…that’s what they’re there for. Also, there is a paper (the one that was originally published in Italian as noted near the link to down load an ENGLISH PDF of the paper) that talks about collecting, taking notes on, drying, photographying, etc. amanitas. Amanitas need to be dried faster than material from some other genera so splitting them in half or in quarters longitudinally, taking the cap off the stem, etc. all are useful in getting the best possible drying. Good luck! And if at first you don’t succeed,…try at least a few more times.

Very best,

R.

Thanks, Rod
By: Eric Smith (esmith)
2010-01-19 20:57:56 EST (-0500)

for your awesome insight. I had no idea of the existence of the “internal limb”. I had this originally labelled A. vaginata var. alba, but thought later that the annulus had collapsed and fallen; hence the A. spreta ID.

This particular specimen was found in hard packed sand under an oak, in an oak/pine forest primarily with white oak I believe. Unfortunately, I’m still learning trees as well, so I can’t tell you if hemlock was present.

I’ve had at least one other observation of this species and I hope/expect to find some next season. I’ll gladly collect samples and send them to you.

Thanks again.

This is cool…, but it’s not spreta…
By: R. E. Tulloss (ret)
2010-01-18 23:40:27 EST (-0500)

Amanita spreta would have a distinct skirt on the stem that becomes gray rather quickly, and can be very dark in age. Also, the sack at the stipe base is usually (proportionally speaking) less than half the height of the sack in these pictures; also, the stem in these pictures is more slender than one often sees in A. spreta. Amanita spreta is the closest relative to Amanita caesarea that we know of in Canada and the U.S. Yes, its not bright colored; but its anatomy is very, very close to that of A. caesarea.

The species pictured in these interesting photographs is very probably a species of sect. Vaginatae and not of sect. Caesareae. I sincerely doubt that there is a name for the entity here depicted. I’d really like to know more about the mushroom and, if dried material of this critter can be obtained in future, I’d love to have some good samples.

Bob, can you tell us what trees were in the immediate area? Was it by any chance in a hemlock-hardwood forest? I have seen something that people call “A. vaginata var. alba” toward the end of June in such forest in NW New Jersey…a few times over 30 years. It can’t be the European mushroom which has that name, but it certainly is an interesting species in sect. Vaginatae. Your pictures show very well how weakly constructed the volval sac is. Also (and I haven’t seen this in a picture before), I can clearly see that there was an internal limb in the volva. You can see some volval material that rises up along the stipe surface just above the point at which the main part of the volva curves up and away from the stipe. The part of the volva rising up against the stem is the internal limb of the volva. During fruitbody development, the internal limb was beween the stem and the edges of the developing gills. The color, position, consistency, and persistence of the internal limb can be useful characters in identifying species that are otherwise hard to separate with the unaided eye in sect. Vaginatae.

Very cool to have captured this character in a picture.

Very best,

R.

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