| Closterium navicula; two specimens of a very small Closterium species. C. navicula has a single crystal in the round vacuoles. (1) |
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| Closterium navicula; if nutrients are abundant mass development may occur. (1) |
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| Closterium navicula; another specimen.(1) |
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| Location: Griendtsveen NL (1) |
| Habitat: detritus (1) |
| Date: 20.09.2016 (1) |
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