Species Diversity: The genus Cellaria has a cosmopolitan distribution and includes several species. Notably, the Zealandian Region, centered around New Zealand, boasts the highest diversity of Cellaria species worldwide. Within this region, there are three described species and an impressive 11 undescribed living species.[2]
Cellaria fistulosa: One specific species, Cellaria fistulosa, grows to around 5 to 6 cm in height. It forms yellowish cream-colored clumps and is easily identifiable by its hexagonally shaped zooids. These zooids grow in a column, with each one in contact with the zooid above and below it.[3]