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That, plus the appearance in the photos would suggest a Nolanea. They are a relatively obscure genus, in that there are few published references (and I have none of them). It resembles Nolanea conica, although the photos I have of that species are a bit more purplish looking than your specimen.
Nolaneas should be considered very poisonous. Definitely do *not* eat.
If it is a Nolanea, it's probably the most obscure mushroom I've ever seen posted out here. A very interesting specimen!