Taxon Account

Melosira C.A. Agardh; 1824; 14

Key references

Houk V. 2003. Atlas of Freshwater Centric Diatoms with a Brief Key and Descriptions. Part 1. Melosiraceae, Orthoseiraceae, Paraliaceae and Aulacoseiraceae. Czech Phycology Supplement Vol.1, Czech Phycological Society, Olomouc. 27 pp

Morphology

Frustules isovalvar, radially symmetrical. Cells cylindrical to ± spherical; circular in outline. Isolated valves lie in valve or girdle view. Cells form chain-like colonies, attached to each other by mucilage pads on the valve face.

Valves chambered (loculate), though this is not obvious in LM; chambers opening externally by many tiny pores, internally by rather larger pores. The loculi are randomly arranged or lie in rows radiating from the centre. Small spines and granules may be present externally, especially in the region where adjacent cells touch and link together; a circular flange (collar=carina) may be present at some distance from the valve centre.

The central part of the valve is often differently structured and has more irregularly arranged chambers.

Several wide porous bands are present. Chloroplasts several to many, plate-like, lobed, each with a central pyrenoid.

Literature

References are given in chronological order.

Reference
Citation
Agardh, C.A. 1824. Systema Algarum. Adumbravit C.A. Agardh. Lundae Literis Berlingianis. Lundae. xxxvii, 312 pp.. Morphology; Taxonomy; Description
Round F.E., Crawford R.M., Mann D.G. 1990. The Diatoms. Biology & Morphology of the Genera. Cambridge University Press, Cambridge. 747 pp Morphology; Illustrations
Houk V. 2003. Atlas of Freshwater Centric Diatoms with a Brief Key and Descriptions. Part 1. Melosiraceae, Orthoseiraceae, Paraliaceae and Aulacoseiraceae. Czech Phycology Supplement Vol.1, Czech Phycological Society, Olomouc. 27 pp Morphology; Illustrations;
Metzeltin D., Lange-Bertalot H. 2007. Tropical diatoms of South America II. Special remarks on biogeography disjunction. Iconographia Diatomologica, Vol. 18., Annotated Diatom Micrographs. Diversity-Taxonomy-Biogeography. H. Lange-Bertalot (ed.), A.R.G. Gantner Verlag K.G. 877 pp Morphology
Houk V., Klee R., Passauer U. 2007. Observations on taxa of Melosira sensu lato among the slides from the Grunow Diatom Collection in Vienna (Austria). Part 1. Diatom Research. 22(1): 57-80. Morphology; Illustrations
This page should be cited as:

Mann D. G. Melosira C.A. Agardh; 1824; 14. 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=3720. [Accessed:  ].

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Record last modified: 27/12/2020