Today I learned about Merisopedia, a genus of cyanobacteria. Species in this genus grow in rectangular grids. They look like this:
Merisopedia species can be found all over the planet, including the Amazon, China, and Nigeria.
|Well-regimented. From Photomicrographs of the freshwater algae Vol. 2 by Yamagishi and Akiyama, 1984.|