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Same south-facing slope on my lawn where I have observed hundreds of examples of A. rooseveltensis over the past 15 years (10′ × 15′ area with some small oaks and a single old large shagbark hickory tree along a wood border).

This mushroom has basically the same color scheme as A. rooseveltensis, gray cap, white stipe, although with a very slightly olivaceous tone on the disc. White floccose deposits on stipe, long deep striations along the cap margin, white membranous volva that’s buried in the soil and breaks apart easily are all traits associated with rooseveltensis. This specimen is larger and more robust that most of the rooseveltensis I have observed in this spot. But, what really sets this one apart from the others is the size and shape of the spores, 11-16 × 7-12 with highly variable Q. Q’ appears to exceed 1.5.

Spored photographed from print collected on a slide. Two slightly different distances from the stipe represented, but in each case the spores fell from less than 1 cm from the cap margin. (Dimensions observed in photos need to be increased by ~17%.)


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The voucher material for this observation has been accessioned in our herbarium.
By: R. E. Tulloss (ret)
2018-07-19 09:29:29 CDT (-0400)

Thank you, David.

Very best,


This one is earmarked…
By: Dave W (Dave W)
2018-01-08 20:53:01 CST (-0500)

for submission to RET.