Desmids and sphagnum moss. Darkfield illuminated polarised light micrograph of Micrasterias apiculata (green, round) amongst Sphagnum sp. moss leaves (background). Desmids are a common group of freshwater single-celled algae that have intricate cell walls. Micrasterias is highly adapted to nutrient poor, acidic water. Magnification: x200 when printed 10 centimetres wide.
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