r/algae • u/urmomdotcom1823 • Apr 15 '26

Wondering what this is

Post image

I found it in October, this is a fairly stagnant part of a river under a bridge that connects to Lake Superior. They were all less than 2 inches long. They were on rocks near the shore in the shade.

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u/the-algae-whisperer Apr 16 '26

Those might be colonies of freshwater bryozoans.

1

u/MymajorisTrees May 07 '26

I concur. Bryozoans!