I found many coenobia of Coelastrum pseudomicroporum in the plankton of the pond of the waste disposal company Constance. The coenobia had a diameter of 20–30 µm and were thus somewhat smaller than reported by Komerek & Fott (1983), who indicate diameters of up to 45 µm.

The cells in the coenobia are ovoid-shaped as drawn by Sodomkova (s. drawings above) and connected via short bridges to 4–6 neighboring cells. In the center of the coenobium there is a cavity (hard to see).

Coelastrum pseudomicroporum differs from the similar species Coelastrum microporum by the short projections with which the cells are connected to each other. In Coelastrum microporum, the cells touch directly without a connecting piece in between.