| Cosmarium margaritiferum; a species with smooth apices and one pyrenoid per semicell. (1) |
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| Cosmarium margaritiferum; another specimen from (2) |
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| Location: Hagen, Germany; garden; bird bath (1); Hattingen Oberstueter; Treppe (2) |
| Habitat: detritus, together with Haematococcus pluvialis, Nostoc commune and Philodina roseola (1); Moss on concrete (2) |
| Date: 16.02.2016 (1); 0.02.2016 (2) |
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