Desmids –
Archaeplastida (Part)

Observations on ***Staurastrum arcuatum* var. *subavicula***

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Staurastrum arcuatum var. subavicula P.Lundell 1871

Most likely ID: n.a.

Basionym: Staurastrum arcuatum subsp. subavicula West 1892

Add’l Synonyms: Staurastrum subavicula (West) West & G.S.West 1894
Staurastrum vastum (Schmidle) Schmidle 1896
Staurastrum dentiphorum Uherkovich 1959

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

Three images.

First:	Synoptic representation of the cell wall. Especially in the upper part of the picture, the existence of the gelatinous sheath is impressively illustrated by the symbiotic bacteria embedded in it.
Second:	Optical cross-section through the chloroplasts showing some of their lobes and storage substances (fat droplets called oleosomes).
Third:	The optical cross section through the cell shows the two pyrenoids and storage substances (oleosomes). In the pyrenoids, the cell produces the storage substance starch.

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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.

© 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.