u/Content-Message-8700

Had this odd hairlike, spiky brown mold (?) grow on the baseboard in my bathroom. This is a half bathroom on the bottom floor of an older structure with a crawl space. I cleaned last spring and it did not come back. It has returned this year and seems to be growing out of the crack between the baseboard and floor, as well as out of the baseboard itself.

Has a spongey, almost mushroom like texture, making me wonder if this is mold after all? Any thoughts are appreciated!