Slime mold found near the river.
They are not fungi.
Have a look at Wikipedia. A short extract:” Today, slime molds have been divided between several supergroups, none of which is included in the kingdom Fungi.
Slime molds can generally be divided into two main groups.
- A plasmodial slime mold is enclosed within a single membrane without walls and is one large cell. This “supercell” (a syncytium) is essentially a bag of cytoplasm containing thousands of individual nuclei. See heterokaryosis.
- By contrast, cellular slime molds spend most of their lives as individual unicellular protists, but when a chemical signal is secreted, they assemble into a cluster that acts as one organism”
I don’t know the group nor the name of that one.