Ulothrix tenuissima
- kingdom: Plantae
- phylum: Chlorophyta
- class: Ulvophyceae
- order: Ulotrichales
- family: Ulotrichaceae
- genus: Ulothrix
- species: Ulothrix tenuissima
Dutch Harbor- Unalaska
Alaska- Bridgeport
- New Milford
- West Haven
Connecticut- Lewiston Orchards
Idaho
United States