I checked the exact spot yesterday (on my front lawn), specifically for examples of this taxon, and found none. Thus, this mushroom fruited last night or early this morning. Mature specimen found just after 11 AM today. This one has a rather pale cap surface, although not quite as pale as the photo implies (viewed first-hand a bit more gray). I managed to catch a glimpse of it just before the lawn mower spotted it.

Notable traits include, silvery gray to gray cap often with particles of soil on the surface, fragile membranous basal volva buried in the soil, occurrence in an open grassy area, stipe surface with small white floccose deposits that are easily rubbed off. The basal volva is typically difficult to remove intact from the substrate. The whitish “plate” seen next to the mushroom (3rd photo down) is part of the volval remnant.

Short gill ends truncate to concave.

There are two different spots on my property where I find this type mushroom. Each spot features mature shagbark hickory. In the case of the mushroom seen here, there is little doubt about the symbiont being the large hickory tree. The only other tree close enough to qualify is a red maple that we planted. On this part of the lawn, including a south-facing slope, I have seen hundreds of examples of this taxon over the 17+ summers I have lived here.

Exact location, 239 Golf Course Road, Hunlock Creek, PA.

Scoped spores in several different areas of a print. Length, width, and quotient (Q), were all fairly variable. The majority of the spores seen were ellipsoid. But some were broadly ellipsoid, a few were subglobose, and a very few were elongate (the latter possibly due to partially collapsed lateral spore wall). A few spores appeared with globose profile, although in at least some cases this may be due to a head-on alignment of the spore. But a few rather large ones appeared globose. For the most part, range of dimensions was 9-12 × 7-9, but one really long spore had length ~14 and a few rather short ones had (perceived) lengths ~8.

Regarding spore dimensions for this taxon, over the years I have observed considerable variation… to the point where I wonder if here may be a cryptic species (or maybe a large-spored variety of rooseveltensis) present in the same area. See obs 289181. The one thing about the spores that seems to be constant for this silvery-gray capped taxon with the rooting stipe is that in any given collection most of the spores are ellipsoid.

NAMP accession #58763.


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Created: 2018-07-03 18:01:54 PDT (-0700)
Last modified: 2018-07-04 10:41:11 PDT (-0700)
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