Phylum: Chlorophyta   Family: Haematococcaceae

Haematococcus pluvialis Flotow

A common and widely distributed species but rarely recoded. Found in small rock pools, ponds and bird baths

References: 
John, D.M., Whitton, B.A. & Brook, A.J. (2011) - The Freshwater Algal Flora of the British Isles