Willea crucifera, a green algae species, features cells that are cross-shaped (cruciform), with four arms radiating from a central point. These cells are small and have a smooth, firm cell wall supporting their structure. Each cell contains chloroplasts positioned within the arms for photosynthesis, alongside a centrally located nucleus. Reproduction occurs through asexual cell division within the cruciform arrangement. Commonly found in freshwater habitats like ponds and lakes, Willea crucifera contributes to the phytoplankton community in these aquatic environments.