Members of this group tend to form colonies and are photosynthetic organisms which live primarily in freshwater. Their yellow-green colour comes from various xanthins as well as chlorophylls a, c, and e. About 100 different species are known.- Category ID : 422714
Brief discussion of the biology and ecology of this group of photosynthetic organisms which live primarily in freshwater, but also are found in marine waters, on damp soil or on tree trunks.