Desmids –
Archaeplastida (Part)

Observations on Xanthidium armatum

Gallery Prof. Rupert Lenzenweger

Protisten / Home / Algae green-colored (2: Desmids): Streptophyta / Zygnematophyceae / Zygnematophycidae / Desmidiales / Desmidiaceae / Xanthidium armatum – Prof. R. Lenzenweger

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Xanthidium armatum Brébisson ex Ralfs 1848

Most likely ID: n.a.

Basionym: n.a.

Add’l Synonyms: Heterocarpella armata Brébisson 1839
                               Cosmarium armatum Brébisson 1840
                               Euastrum armatum (L.A.Brébisson) Kützing 1845
                               Euastrum bigorianum Perty 1849
                               Zygoxanthium bigorrianum (Perty) Perty 1852
                               Xanthidium bigorrianum (Perty) Rabenhorst 1868
                               Schizacanthum armatum (Brébisson ex Ralfs) Wille 1890

Description: The cells are 1.5 times longer than wide and rectangular in shape. The cell halves are octagonal with 6 pairs of furcated processi. In the center of the cell halves is a star shaped branched processus. The cell terminations are broadly truncated. The central cuts are deep and strongly broadened towards the periphery.

Dimension: Length 115–185 µm, width 80–130 µm (including spines).

Occurrence: As acidophilic alga common in acidic sphagnum bogs. Ubiquitous distribution.

Left: Original graphic by Prof. Lenzenweger.
Right: Photomicrograph by Prof. Lenzenweger. For microphotography, the microscope illumination was adjusted in such a way that as many features as possible that are important for species identification are prominently displayed.

© Wolfgang Bettighofer,
images under Creative Commons License V 3.0 (CC BY-NC-SA).
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Observations on Xanthidium armatum

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