Taxon Account

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.

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., Chudaev D., 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