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~7cm; spongy; hollow inside; morel-like; and spore bearing tip does not go all the way around the stipe.
Yard
I've been getting these in my garden too, although mine have a pinkish red stipe. Weird looking things, and OMG they stink! Your spotting is a variety of stinkhorn fungi, a member of the Phallus family. This should head you in the right direction.