Phylum: Cyanobacteria   Family: Microchaetaceae

Tolypothrix distorta  Kützing ex Bornet & Flahault, 1886

Free-floating or attached, often with submerged vegetation. Found in lochs and slow-moving water. Rarely recorded

References: 
John, Whitton & Brook (2011) - The Freshwater Algal Flora of the British Isles