Pleurotaenium

In taxonomy, Pleurotaenium is a genus of green algae, specifically of the Placoderm desmids (Desmidiaceae).
Morphology.
Long, cylindrical, bilaterally symmetrical unicells with blunt ends. Ring-like thickening in the central area where the two semicells join. In a good specimen, very delightful to look at due to obvious intracellular activity, especially at the ends.
Reproduction.
Asexual: cells arise from the partitioned parent cell
Sexual: Conjugation (transmission of DNA through nucleus fusion to form a hypnozygote or zygospore, which is a term for a zygote that lies dormant until optimal conditions arise)