Green-colored Algae without Flagella –
Archaeplastida (Part), SAR-Stramenopiles (Part)

Observations on Chaetophoropsis pisiformis

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Chaetophoropsis pisiformis Lemmermann 1900

Most likely ID: n.a.

Basionym: Rivularia pisiformis Roth 1802

Add’l Synonyms: Chaetophora pisiformis (Roth) C.Agardh 1812

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Sampling date 05/2022. Scale bars indicate 0.5 mm (1), 100 µm (2–4).

Four images.

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Place name: Creek in Oder valley 100 km north east of Berlin (Germany)
Latitude: 53.135032 Longitude: 14.348738

Stereo microscope Olympus SZX16/Planapo 2.0x, camera Olympus OM-D M5 MKII. DOF images (3, 4).

Sampling date 10/2007. Scale bar indicates 100 µm.

Chaetophoropsis is a branched filamentous algae that is almost completely embedded in mucus. The species pictured forms cushions that can grow so large that they can be seen with the naked eye as green, gelatinous balls and stick to stones or plants. The mucus serves as protection against grazing. On the surface of these gelatinous balls you can see a large number of colorless cells that protrude from the jelly in the form of hairs (chaetae). These cells do not contain chloroplasts and are used to absorb nutrients.

The brightfield image cannot show the mucus. This young thallus showed only two of these chaetae (see box). The arrow indicates a pyrenoid within a chloroplast.

Place name: Hiddensee Bodden (Germany)
Latitude: 54.582633 Longitude: 13.115051

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF image.

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

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