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Which strongly suggests either Scleroderma with an eroded cap, or Radiigera. Radiigera should have radially arranged peridioles, which I don’t see as even remnants in the photos. So … in the absence of spores, will suggest Scleroderma.
here are the photos of it sliced
Some Scleroderma do have gray-black interiors, at least some of the time. But without an indication of the base, this has more of a look of Pisolithus or one of the hypogeous species with grayish to black interiors. As you mention, the basal attachment becomes critical in such cases. I personallly don’t believe this is a Scleroderma, simply because of the 2 different peridium textures, with a clear mid-point. Such are not present in Sclerodermas in my experience.
need a picture of it cut in half…
I was going to call this Pisolithus. But the blue stain of the peridium and the seemingly huge peridioles make that unlikely unless it is a species novum. Notice that the upper surface looks different from the lower surface, and there appears to be a distinct dividing line in each appearance. For positive ID, would need spores and examination of the base (sterile? rooting? columella present/absent?). Also would help to have all nearby trees (could be fruiting as far away from the host tree as that tree is tall, so many possibilities likely). Notes on odor, and slicing the specimen through the center would also assist my identification. Knowing whether it is a basidiomycete, ascomycete, or something else would also narrow the possibilities. It certainly is interesting, but beyond my immediate experience.