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Diatoms and red algae, light micrograph
Diatoms and red algae. Darkfield illuminated polarised light micrograph of Eunotia sp. (oval, green) and Navicula sp. (long, green) diatoms amongst Batrachospermum sp. freshwater red algae. Diatoms are single-celled photosynthetic algae, of which there are about 100,000 species. They have mineralised cell walls (frustules) that contain silica and provide protection and support. They form an important part of the plankton at the base of the marine and freshwater food chains. Magnification: x400, when printed 10 centimetres wide.
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