Phylum: Chlorophyta   Family: Hydrodictyaceae

Pediastrum angulosum C.G. Ehrenberg ex G. Meneghini 1890

First described by Ehrenberg in Meneghini (1840: 210) but not illustrated. Of the Pediastrum species, this is the only one to show marked angularity of the cells.
Coenobia spherical with 8, 16, 32, 64 & 128 cells: diameters: 60-320 µm.
Marginal cells: 10-36 µm across.
A rare species found in the plankton of acidic pools and bogs.

References: 
Ehrenberg, C.G.in Meneghini, G. (1840). Synopsis Desmidiearum hucusque cognitarum.
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition). The Freshwater Algal Flora of the British Isles.