Phylum: Cyanobacteria   Family: Microcystaceae

Aphanothece stagnina (K.P.J. Sprengel) A. Braun 1863

First described by Sprengel (1807: 14) as Coccochloris stagnina. It was later moved by Braun (1863: no. 1572) to its current position.
Cell dimensions: L: 4-11 µm; B: 3-5.5 µm. Colony: up to 4 cm.
Common attached to submerged aquatics and colonies can attain large proportions. Mainly found in slightly alkaline waters and also brackish.

References: 
Braun, A. [in] Rabenhorst, L. (1863). Algen Europa's, Fortsetzung der Algen Sachsens, Resp. Mittel-Europa's.
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition). The Freshwater Algal Flora of the British Isles.
Sprengel, K.P.J. (1807). Mantissa prima florae halensis, addita novarum plantarum centuria.