Observation 64267: Amanita vaginata var. alba Gillet
When: 2011-03-11
No herbarium specimen

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.

Images

136822
136823
dried exsiccata turn beige
136824
136825
check out the constricted volvas
136826
basidia
136827
pileipellis, rather thin and sticky
136828
thin cells of the suprapellis
136829
basidium
136830
typical spore shape
136831
“pseudocheilocystidia” on gill edges
136832
a slice showing undisturbed orientation of cells in the lamellae
136833
1/2 of a lamella cross-section, all hyphae are more or less filamentous. The specimen was mature.
136834
another view of the lamella trama hyphae
136835
more basidia; they’re rather huge
136836
Copyright © 2011 Nina Filippova
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
136837
Copyright © 2011 Nina Filippova
Lamellae margins low-res, you can see the fuzziness if you view the origina.
136838
Copyright © 2011 Nina Filippova
Pileus margin low-res
136839
Copyright © 2011 Nina Filippova
Stipe surface low-res

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Created: 2011-03-11 11:12:12 CST (-0500)
Last modified: 2011-03-11 11:29:24 CST (-0500)
Viewed: 98 times, last viewed: 2016-12-03 12:53:26 CST (-0500)
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