Desmids –
Archaeplastida (Part)

Observations on Cosmarium quadratum

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Position in the EOL taxonomic tree. Please click on the tree view below to access EOL (Encyclopedia of Life).

Cosmarium quadratum Ralfs ex Ralfs 1848

Most likely ID: n.a.

Basionym: n.a.

Add’l Synonyms: Didymidium quadratum (Ralfs ex Ralfs) Reinsch 1867
Cosmarium quadratum f. majus Nordstedt 1888

Sampling date 06/2024. Scale bars indicate 25 µm.

Five images. Optical journey into the cell.

First:	Synoptic representation of the cell with finely dotted cell wall decoration. This dots are cell wall pores through which the protective mucilage is deposited.
Second and third:	Two optical cross-section showing lobes of the chloroplasts.
Fourth:	Nucleus with wings of the chloroplasts.
Fifth:	Nucleus with the four pyrenoids.

Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!

Place name: Wetland at the Pillersee (Tyrol, Austria)
Latitude: 47.531785 Longitude: 12.573095

Microscope Zeiss Universal, camera Olympus OM-D M5 MKII. DOF images.

Sampling date 06/2024. Scale bars indicate 25 µm.

Four images. Optical journey into the cell. Same cell as above, but higher objective aperture.
The circular pattern on the cell wall is caused by a slight contusion caused by the coverslip pressure.

First:	Synoptic representation of the cell with finely dotted cell wall decoration.
Second:	Optical cross-section showing lobes of the chloroplasts.
Third:	Nucleus with pyrenoids.
Fourth:	Pyrenoids.

Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!

Place name: Wetland at the Pillersee (Tyrol, Austria)
Latitude: 47.531785 Longitude: 12.573095

Microscope Zeiss Universal, camera Olympus OM-D M5 MKII. DOF images.

Sampling date 06/2023. Scale bars indicate 50 µm.

Three images.

First:	Synoptic representation of the lobose chloroplasts.
Second:	Optical cross-section through the chloroplasts showing pyrenoids and the nucleus.
Third:	Same as image No. 2. using brightfield.

Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!

Place name: Wetland Lauchseemoor, Fieberbrunn (Tyrol, Austria)
Latitude: 47.46954439 Longitude: 12.53826499

Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII. DOF images.

© Wolfgang Bettighofer,
images under Creative Commons License V 3.0 (CC BY-NC-SA).
For permission to use of (high resolution) images please contact postmaster@protisten.de.

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Observations on Cosmarium quadratum

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