Phylum: Chlorophyta   Family: Microsporaceae

Microspora floccosa (J.-P. É. Vaucher) G. Thuret 1850

First described and illustrated by Vaucher (1803: 131, pl. 16: 3) as Prolifera floccosa. It was later moved by Thuret (1850: 222) to its current position. Noted for its net-like chloroplasts.
Cell dimensions: L. 15-55 µm; B. 10-22 µm.
Common in ponds and drinking troughs, where it forms dense tangled masses.

References: 
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition). The Freshwater Algal Flora of the British Isles.
Thuret, G. (1850). Recherches sur les zoospores des algues et les anthéridies des cryptogames.
Vaucher, J.-P. É. (1803). Histoire des conferves d'eau douce. Contenant leurs différens modes de reproduction, et la description de leurs principales espèces, suivie de l'histoire des trémelles et des ulves d'eau douce.