Observation 169331: Amanita sect. Amidella
When: 2014-07-07

Notes: > A single specimen growing under young maples with mature red oaks farther out.
> Cap diameter = 6.7 cm; the mushroom is 8 cm tall
> The fresh specimen was odorless, but dried material had a pleasant fungoid
odor.
> Spore deposit white; strongly dextrinoid in 5% Lugol solution.
> Spore measurements:
L x W [36/1/1] = 8.8 – 11.6 × 4.7 – 6.0 (-7.0) um; mostly elongate
L’ = 10.0, W’ = 5.5 um
Q = (1.47-) 1.58 – 2.0 (-2.2); Q’ = 1.83

While Lugol’s reagent will not reliably confirm amyloidity, surprisingly it greatly enhances visualization of Russula and Amanita subgenus Lepidella spores at high magnification (I haven’t tried this yet with non-amyloid spores). The trick is letting the solution under the cover slip to lose its background color (iodine dissipates/evaporates or gets destroyed photo-chemically), which typically occurs within half hour or so if you allow the slide to sit under bright ambient light. This is important because freshly made slides look blurry and rather dark at 100×. Mind you that spores remain stained permanently. Removing excess iodine from the slide will allow you to focus sharply and experience a much better contrast and low eye strain.

Proposed Names

57% (1)
Eye3 Eyes3
Recognized by sight
28% (1)
Based on microscopic features: The spore measurements suggest A. pseudovolvata; however, the cap margin is not lined

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Thanks Igor,
By: groundhog
2014-10-14 12:16:10 CDT (-0400)

This material has been received and accessioned to Rod’s herbarium.
-Naomi

Nice photo
By: Martin Livezey (MLivezey)
2014-07-09 19:43:05 CDT (-0400)

Good work!

Created: 2014-07-09 15:59:12 CDT (-0400)
Last modified: 2014-07-09 16:25:03 CDT (-0400)
Viewed: 31 times, last viewed: 2016-05-31 19:03:39 CDT (-0400)
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