You are correct about the number, David.
I became concerned that I had mixed two different taxa under that number and didn’t post what I thought might be mixed data. I’m pretty sure now that I did have two things mixed. One of the two taxa has a cap that becomes very distinctivelly dark and metallic which reminds me of wrought iron after it has cooled. (My high school actually had a forge shop. No, I wasn’t particularly good at it.)
The (or a) second taxon could very well be the one in your picture.
Both occurred almost exclusively under oaks. They are small, so they seem common in lawns, but that could be because the grass is short enough so that you can see them. Both had spores that had average Q ellipsoid (usually between 1.3 and 1.6). The one that looks like the one in these present photos is just starting to show in lawns here in Central NJ. I’ve noticed that squirrels will eat the cap off and leave the stark, white stem standing. I think I remember that the volval sac sometimes is hard to collect with the stem.
I’m not sure how soon I can get to this, but this really is one of the taxa that ought to be sorted out and posted on WAO.
Good memory, David.