Notes:
A single fruiting body growing in mixed deciduous wood on the edge of the Green Trail, about 50 yards to the north of its intersection with the Red Trail. Nearby trees included red and white oaks, shagbark hickory, all of which could be the host.
The overall morphology can be inferred from the photos. One of the most interesting features are the shaggy (but not pulverulent) limbus internus deposits on the stipe; one of them forms a distinct “ring”. Weak and short marginal striations were perceived though the arrangement of the volva on cap edge.
The mushroom is 7.5 cm tall. The almost expanded cap is 5.5 cm wide, its flesh 5-6 mm thick above the stipe. The gills are 9 mm wide; short gills are mostly truncate or subtruncate, some with a rounded edge, a few really short ones are attenuate. The stipe is ~7cm long, 1 cm wide at the flaring apex, 7 mm wide at the narrowest point (1" below the apex) and 1.5 cm wide inside the volval cup; central canal is stuffed with a rather dense tissue. The volva is 2.8 cm tall and 2 cm wide; its walls are 2.5 mm thick. The spores are elongate to cylindric at x400 with no mounting agent present.
The specimen was preserved; a fresh gill fragment was also extracted into CTAB buffer.
Spore measurements:
Mounted in Melzer’s and measured only in the profile (dorsi-ventral) view.
[40/1/1]: L x W = 7.4~11.6 × 4.7~5.6 (-5.8) μm, L’ x W’ = 9.6 × 5.1 µm; Q = (1.48-) 1.58~2.17 (-2.25), Q’ = 1.87;
White (as a spore print), smooth, hyaline and amyloid (staining was a bit delayed); symmetrical and oblong in face view, generally inequilateral in profile view due to a visible suprahilar depression, with a rounded and symmetrical distal end and an asymmetrical and somewhat flattened proximal end, round in cross-section, mostly elongate (31 spores), rarely upper-end ellipsoid (2 spores) and and sometimes cylindric (7 spores).
A comparison of these data with the spore measurements of known NA sect. Amidella taxa described in RET’s website gave an excellent match to Amanita pseudovolvata:
“[1337/66/55] L x W = (7.6-) 8.5 – 10.6 (-11.0) x (4.5-) 4.8 – 5.9 (-6.5) µm; L’ x W’ = 9.6 × 5.2 µm; Q = (1.42-) 1.64 – 2.04 (-2.14); Q’ = 1.85, hyaline, colorless, thin-walled, smooth, amyloid, elongate, occasionally ellipsoid, occasionally cylindric.”
Even though the spores of A. whetstoneae have very similar dimensions and Q values, it can be eliminated from consideration based on gross morphology (e.g., the size and shape of the volval sack).

Species Lists

Images

Natural light, some greenish “canopy effect”
Natural light, some greenish “canopy effect”
Natural light and color (“canopy effect” minimized)
Natural light and color (“canopy effect” minimized)
Details of stipe ornamentation
Natural light + green “canopy effect”
Taken indoors, flash deployed
Mounted in Melzer’s and viewed at x1000

Proposed Names

-29% (1)
Based on microscopic features: Matching spore size & shape
-9% (2)
Recognized by sight

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= Observer’s choice
= Current consensus

Comments

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It is very difficult to name an Amidella from a photograph.
By: R. E. Tulloss (ret)
2021-03-05 09:49:37 CST (-0500)

DNA is now being applied to this problem in North America and hopefully a sorting will occur that will allow better chracterization or the individual organisms. Igor and RET are collaborating on the project that is just being organized.

R