Sullivan, M.,
Frankovich, T.,
Ashworth, M.
(2022).
Grammatophora.
In Diatoms of North America.
Retrieved November 21, 2024, from https://diatoms.org/genera/grammatophora
Araphid
Grammatophora
Valvocopula with undulate septa
Chloroplast lobes within valve and septa
Apical pore fields with small spines
Transverse areolae fine, poroid, in linear or quincunx pattern
Rimoportulae two
Valves are elongate with rounded apices. In girdle view, frustules are square to nearly rectangular. The valve margins may be smooth, slightly inflated at the center, arcuate, or undulate. A pseudoseptum is present at both valve ends. Striae are uniseriate and composed of poroid areolae. Striae are organized in transverse rows, or in a...