Phylum: Charophyta   Family: Desmidiaceae

Cosmarium goniodes var. subturgidum West & G.S. West 1902

In Europe this small taxon is regarded as widely distributed in acidic oligo-mesotrophic habitats. It was first recorded in the Outer Hebrides in 2023 but could easily be overlooked due to its small size.

References: 
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium.