Tabellaria fenestrata lacks marginal spines, has distinctly capitate apices and a narrow axial area, but no hyaline central area. The girdle bands in T. fenestrata are open and lack rudimentary septa. Tabellaria flocculosa var. linearis is similiar to T. flocculosa in that they both have apices that are not distinctly capitate. In both species, there is a narrow axial area. However, in T. flocculosa var. linearis, apices are as wide, or wider, than the central inflation. There is no hyaline central area in T. flocculosa var. linearis. Rudimentary septa may be present.

According to Koppen (1975) Tabellaria quadriseptata lacks distinguishing characters from T. flocculosa, and they should be considered conspecific.

LM scalebar = 10 µm
Tabellaria flocculosa LM7 Tabellaria flocculosa LM2 Tabellaria flocculosa LM5 Tabellaria flocculosa LM4 Kan2  Strain Iv  Girdle  Cropped Kan2  Strain Iv  Cropped Tabellaria flocculosa LM6
Length Range
11.2-82.7 µm
Width Range
3.2-8.8 µm
Striae in 10 µm

Tabellaria fenestrata

(Lyngb.) Kütz. 1844

Kan 5 1  Cropped Tabellaria fenestrata LM1 Kan 1  Cropped Kan  Girdle  Cropped Kan 4  Cropped Kan 3  Cropped Kan 2  Cropped
Length Range
39.0-83.0 µm
Width Range
2.1-6.9 µm
Striae in 10 µm

Also compare to

Tabellaria flocculosa var. linearis