Allenella

Allenella is a genus of air-dwelling, freshwater algae belonging to the family Trebouxiophyceae. This microscopic green alga is generally found suspended in the atmosphere or attached to surfaces like tree bark and rocks, particularly in humid environments. It is capable of withstanding desiccation and periods of low water availability. Allenella contributes to atmospheric carbon fixation and the formation of biofilms. The genus is characterized by its distinctive morphology, including its cell shape and chloroplast structure, which distinguishes it from other closely related genera within the Trebouxiophyceae. Further research is ongoing to fully understand its ecological role and physiological adaptations.