*they are marine habitat.
*they show great variation in size e.g. Ectocarpus are simple branched and filamentous, and Kelp profusely branched and approx 100 m long.
*it has chlorophyll a and c.
*it has other pigments like carotenoids and xanthophylls.
* food is stored as complex carbohydrate,laminarin or mannitol.
*vegetative cell has gelatinous coating of algin.
*the plant body is usually attached to the substratum by a holdfast, and has stalk, the stipe and leaf like photosynthetic organ-the frond.
*vegetative reproduction by fragmentation.
*asexual reproduction by biflagellated zoospores that are pear shaped and two unequal laterally attached flagella.
*sexual reproduction by gametes, they may be isogamous, anisogamous or oogamous.
*e.g.- Ectocarpus, Dictyota, Laminaria, Sargassum, Fucus etc
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