Welcome to the Diatom Image Database! The Periphyton Group at Florida International University created and maintains the Diatom Image Database, which includes over 980 diatom taxa found in the greater Everglades region of south Florida. Please send questions or comments about the Diatom Image Database to Franco Tobias .
You can also click on one of labeled areas on the map to browse by location.
Schmidt, a. (1874-1959). Atlas der Diatomaceen-Kunde: Band I-III. O. R. Reisland, Leipzig. pp. 151-153 [fig.159b]
Bacillaria ulna Nitzsch 1817; Synedra ulna (Nitzsch) Ehrenberg 1832
Frustule is linear in girdle view; valve is linear to linear-lanceolate, with spathulate to broadly rounded to capitate apices; transapical striae are clearly punctate, parallel, may be convergent at the very ends; pseudoraphe is narrowly linear; central area may be irregular, to small, to completely lacking; length is 50-350µm, breadth is 5-9µm; striae count is 8-12µm (most with ~10µm) in 10µm