Chromista

The Chromista are a paraphyletic eukaryotic supergroup, which may be treated as a separate kingdom or included among the Protista. They include all algae whose chloroplasts contain chlorophylls a and c, as well as various colorless forms that are closely related to them. These are surrounded by four membranes, and are believed to have been acquired from some red alga. There are three different groups:Heterokonts or stramenopiles - brown algae, diatoms, water moulds, etc.HaptophytesCryptomonads
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A major taxon in the Kingdom Ptotoctista (also called Heterokonta). They are mostly photosynthetic algae but distinct from the rest of the algae. They have genetic material derived from four different ancestors (purple bacteria, cyanobacteria, red alga and green alga). Link to Chromista.