Cosmarium subcostatum
- kingdom: Plantae
- phylum: Charophyta
- class: Zygnematophyceae
- order: Zygnematales
- family: Desmidiaceae
- genus: Cosmarium
- species: Cosmarium subcostatum
Carmel-by-the-Sea
California
United States
Cosmarium subcostatum Carmel-by-the-Sea