Phylum: Heterokontophyta   Family: Chlorobotryaceae

Characiopsis acuta (A. Braun) A. Borzì 1895

First described and illustrated by Braun (1855: 41, pl. 5: C) as Characium acutum. It was later moved to its current position by (Borzì 1895: 153). One of numerous algae that grow attached to filamentous algae and other substrates.
Cell dimensions: L: 15-28 µm; B: 6-11 µm.
Probably widespread but infrequently recorded due to its small size. Found in circum-neutral waters with aquatics.

References: 
Borzí, A. (1895). Studi algologici: saggio di richerche sulla biologia delle alghe. Fasc. II.
Braun, A. (1855). Algarum unicellularium genera nova et minus cognita praemissis observationibus de algis unicellularibus in genere.
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition). The Freshwater Algal Flora of the British Isles.