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Fascicle

Fascia

Fibulae

Series, or bundles, of rows of areolae oriented radially in some centric diatoms are termed fascicles.

Image Credit: Sarah Spaulding

Stephanodiscus niagarae is characterized by fasicles of 2-3.

Image Credit: Sarah Spaulding

Detail of S. niagarae, with the costae marked in red. The costae separate the 2-3 rows, or fascicles, of areolae.