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I don't think it is a slime mold either as the mold seems to 'mature' over the feathery white that precedes it.
Thanks for the welcome but I do not think this ID is correct. Look closely at the photo and you will see bright white edges that are eventually...
I would like to know what this growth is. It is located in an old home's crawlspace and is a fairly substantial growth. Any help would be...