Notes: Here are some A. vaginata var. alba-like creatures that are common in late summer around Khanty-Mansiysk, in Midwestern Siberia.
Macroscopically they’re more or less compliant with the general notion of what the species should look like, except one thing – I failed to find any mentioning of a constricted volva, and as you can see, the volva of these specimens is noticeably constricted in the middle. The last macroscopic image is from 2008 (taken by Nina Filippova) and the constricted volva is there, so it’s probably not a seasonal/very local aberration.
Does anyone know whether this constriction is a critical fieldmark?
Microscopically it’s somewhat different from the visually similar Southwestern Siberian white Amanita sect. Vaginatae in having very few inflated cells in the lamella trama (I posted an in situ image of our local species some time ago and I’ll post some micros soon, too), not as different as other white Amanita sect. Vaginatae species growing around Khanty-Mansiysk, though (those have inflated cells in the subhymenium and resemble A. islandica/arctica/…)
Or maybe I’m totally wrong. Amanitas are so tricky!
(MO is acting weird in Opera, it ignores the “Upload another” button so I’ll have to post the rest of the images separately.
P.S. I should’ve put scale bars on the microphotos, my bad. I’ll fix it as soon as I have some free time.
An ex-situ image of the same (?) Amanita found in the same forest two years earlier by Nina Filippova. Same small umbo, same constricted volva
Lamellae margins low-res, you can see the fuzziness if you view the origina.
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Created: 2011-03-11 12:42:12 NST (-0330)
Last modified: 2011-03-11 12:59:24 NST (-0330)
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