When: 2019-07-07

Collection location: Gibsonia, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

Specimen available

Collected by R. Bosiljevac from a lawn.
Spores mainly broadly ellipsoid, a few subglobose, a few ellipsoid. Many with one large oil droplet. 8-11 × 6.5-8.
Appears to represent A. rooseveltensis, or one of related species featuring ellipsoid spores.


Photo by R. Bosiljevac.
Photo by R. Bosiljevac.

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Thanks, Rod…
By: Dave W (Dave W)
2019-07-12 12:38:49 AEST (+1000)

for the reference to stirps Rooseveltensis.

Originally, a collection from Gibsonia PA posted at wildmushroomhunting showed the more typical gray cap color of rooseveltensis. I suspect the photos seen here may show the same species, with the ambient lighting maybe causing a bit of a shadow on the sunken disc. I have the preserved material, if/when you want to study it I’ll send it.

So far this summer, on my own property I’ve found a few “rooseveltensis” with larger than average spores, but with the typical 1.2<Q<1.4 for most of the spores. The mushrooms first arrived a bit later than usual.

Thanks for the email, David.
By: R. E. Tulloss (ret)
2019-07-12 04:08:38 AEST (+1000)

The cap seems to have a richer brown than rooseveltensis does. One of my projects now (stirred up by the interest of one of Anne Pringle’s students) is whether there are clusters of species of the Vaginatae with broadly ellpisoid to ellispoid spores. And, indeed, there seem to be some. I am modify my thinking about stirps Rooseveltensis just to the extant that it is one of these clusters.


You might see what you think of the members of that group.

Very best,