Fragilaria tenera var. nanana Lange-Bertalot; 2014; 7
Synonymy
Fragilaria nanana Lange-Bertalot 1993
Key references
Lange-Bertalot H., Ulrich S. 2014. Contributions to the taxonomy of needle-shaped Fragilaria und Ulnaria species. Lauterbornia. 78: 1-73.
Morphology
Size
Length 29-85 µm, width 2.0-2.3 µm (Lange-Bertalot & Ulrich 2014).
Shape
Valves linear, gradually tapering from the valve centre, with spatulate or subcapitate ends.
Symmetry
Isopolar, bilaterally symmetrical.
Striae
Striae parallel, opposite or alternating, 18.5-22 in 10 µm (Lange-Bertalot & Ulrich 2014).
Axial area
Narrow, linear.
Central area
Widened, extending to the margin, with ghost striae.
SEM morphology
Uniseriate striae with round or apically elongate areolae.
Two apical pore fields.
One rimoportula near a pore field.
Spines are present along the valve margin.
Length 29-85 µm, width 2.0-2.3 µm (Lange-Bertalot & Ulrich 2014).
Shape
Valves linear, gradually tapering from the valve centre, with spatulate or subcapitate ends.
Symmetry
Isopolar, bilaterally symmetrical.
Striae
Striae parallel, opposite or alternating, 18.5-22 in 10 µm (Lange-Bertalot & Ulrich 2014).
Axial area
Narrow, linear.
Central area
Widened, extending to the margin, with ghost striae.
SEM morphology
Uniseriate striae with round or apically elongate areolae.
Two apical pore fields.
One rimoportula near a pore field.
Spines are present along the valve margin.
Literature
References are given in chronological order.
Reference |
Citation |
|---|---|
| Meister F. 1912. Die Kieselalgen der Schweiz. Beiträge zur Kryptogamenflora der Schweiz. 4(1). K.J. Wyss, Bern. 254 pp; 48 pls | Morphology; Illustrations |
| Lange-Bertalot H. 1993. 85 neue Taxa und über 100 weitere neu definierte Taxa ergänzend zur Süßwasserflora von Mitteleuropa Vol.2/1-4. Bibliotheca Diatomologica 27, J. Cramer, Berlin, Stuttgart. 454 pp | Taxonomy |
| Lange-Bertalot H., Ulrich S. 2014. Contributions to the taxonomy of needle-shaped Fragilaria und Ulnaria species. Lauterbornia. 78: 1-73. | Morphology; Taxonomy; Type Illustration |
Similar Species
Similar species not published on this website:
This page should be cited as:
Jüttner I. Fragilaria tenera var. nanana Lange-Bertalot; 2014; 7. In: Jüttner I., Carter C., Cox E.J., Ector L., Jones V., Kelly M.G., Kennedy B., Mann D.G., Turner J. A., Van de Vijver B., Wetzel C.E., Williams D.M..
Freshwater Diatom Flora of Britain and Ireland. Amgueddfa Cymru - National Museum Wales. Available online at https://naturalhistory.museumwales.ac.uk/diatoms/browsespecies.php?-recid=3553. [Accessed:
].
Image Gallery
Record last modified: 27/12/2020