Chlamydomonas halophile & Chlamydomonas nivalis represent snow algae is found in the Polar Regions imparting red colour. The red colour is due to red pigment Haematochrome.
Chlamydomonas nivalis is a unicellular red-coloured photosynthetic green alga that is found in the snowfields of the alps and polar regions all over the world. They are one of the main algae responsible for causing the phenomenon of watermelon snow, where patches of snow appear red or pink