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Slime mould.
Are Slime Moulds really Fungi?
No, slime moulds are not fungi. They are members of the Kingdom Protozoa. They used to be included among the fungi because people found their dry fruiting structures in the woods when they were out collecting fungi.
In fact, the most characteristic structure of a slime mould is a plasmodium -- a giant amoeba with thousands of nuclei in a single mass of protoplasm. This plasmodium moves around slowly in decaying organic matter or the soil, eating - swallowing up or ingesting -- bacteria and other tiny particles of organic matter. Original public domain image from Flickr
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