Taxon Account

Fragilariforma virescens (Ralfs) D.M.Williams & Round; 1988; 265

Synonymy

Neofragilaria virescens (Ralfs) Williams & Round
Fragilaria virescens Ralfs 1843

Key references

Williams, D.M. and Round, F.E. 1987. Revision of the genus Fragilaria. Diatom Research 2(2):267-288..

Morphology

Shape
Valves linear to linear-elliptic with rostrate ends.

Symmetry
Isopolar, bilaterally symmetrical.

Striae
Parallel, slightly radiate near the valve ends.

Axial area
Narrow linear.

Other features
The cingulum consists of several girdle bands open at the opposite ends of the frustule.


SEM morphology
Striae uniseriate with occluded, round areolae.

One rimoportula near one valve end.

Two apical pore fields present.

Smaller and larger interlinking spines present along the valve margin.

Literature

References are given in chronological order.

Reference
Citation
Ralfs J. 1843. On the Diatomaceae. Annals and Magazine of Natural History. 12: 104-111; pl. 2. Morphology; Taxonomy; Description
Williams, D.M. and Round, F.E. 1987. Revision of the genus Fragilaria. Diatom Research 2(2):267-288.. Taxonomy; Morphology; Illustrations;
Williams D.M., Round F.E. 1988. Fragilariaforma, nom. nov., a new generic name for Neofragilaria Williams & Round. Diatom Research. 3(2): 265-267. Taxonomy
Williams D. 2001. Comments on the structure of “post-auxospore” valves of Fragilariforma virescens. Lange-Bertalot-Festschrift. Studies on Diatoms. Dedicated to Prof. Dr. Dr. h.c. Horst Lange-Bertalot on the occassion of his 65th Birthday. A.R.G. Gantner Verlag K.G., Königstein, Germany. 103-117 pp Illustrations; Biology; Morphology
This page should be cited as:

Williams D. M., Jüttner I. Fragilariforma virescens (Ralfs) D.M.Williams & Round; 1988; 265. In: Jüttner I., Bennion H., Carter C., Cox E.J., Ector L., Flower R., Jones V., Kelly M.G., Mann D.G., Sayer C., Turner J. A., 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=2409. [Accessed:  ].

Image Gallery

Record last modified: 27/12/2020