Algae occur in aquatic (both marine and fresh water), and terrestrial habitat. They are found in damp places, water bodies, in conditions of extreme temperatures (ice cold or hot spring), on the barks of trees, on rocks and woods, on moist surfaces of various places etc. They are associated with other organisms. For example they may be present inside the tissues of other plants (endophytes), in lichens (as symbionts), or as epiphytes or parasites.

Example of  Algae (Occurrence)

Example of Epiphytic algae: Oedognium, Vaucheria, Bulbochaete

Example of Epizoic algae: Chladophora on snail

Example of Endozoic algae: Zoochlorella

Example of Parasitic algae: Cephaleuros virescens, Harveyella

Example of Terrestrial: Fritschiella tuberosa

Example of Cryptophytic: Nostoc
 Laminaria digitata
Example of Marine: Fucus, Laminaria

Example of Halophytic: Chlamydomonas ehrenbergii

Example of Symbiotic: Blue green algae in lichens, Cycas, Anthoceros

Found in mud: Chara

Found at the banks of lakes or ponds: Spirogyra or Rivularia

Found in high temperature: Oscillatoria brewis

Found in very low temperature.In snow, providing different colours to snow are:
a) Red snow is caused by Chlamydomonas nivalis
b) Green snow is caused by Chlamydomonas yellowstonensis
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