Reproduction occurs by fragmentation. Red tides, blue-green algae, and cyanobacteria are examples of harmful algal blooms that can have severe impacts on human health, aquatic ecosystems, and the economy. Rhodophyceae (Red Algae) Phycocolloids protect the algae from desiccation during low-tide, freezing under low tem­perature and injury when beaten against rocks. Most of them are photoautotrophs except few colorless & parasite such as Harveyella which live on other red algae. The edible brown algae are also used as fodder. Most of them lived in freshwater except a few (- 10%) marine forms. Most of Dinophyceae lived in marine water and few are fresh water. Brown Algae contains anchoring organ, a stalk, photosynthetic organs, and reproductive tissues which develop spores and gametes. (adsbygoogle = window.adsbygoogle || []).push({}); © All Rights Reserved By Team Homeomagnet; Do not copy.

Life cycle of Algae: Haplontic, Diplontic, Diplohaplontic, and Triphasic. Brown algae, (class Phaeophyceae), class of about 1,500 species of algae in the division Chromophyta, common in cold waters along continental coasts. He classified algae on the basis of their pigmentation, thallus-structure, reserve food, flagellation & modes of reproduction. (adsbygoogle = window.adsbygoogle || []).push({}); The members of the Division Phaeophyta are commonly known as brown algae, due to the presence of a brown coloured rotenoid, fucoxanthin, in large amounts, which masks the green colour of chlorophyll pigment. Eyespot apparatus Definition, Function, Types, Structure, Proteins. Brown algae comprise about 2000 species. The main storage product is laminarin. It is differentiated into basal holdfast, a near cylindrical stipe and a flattened blade or lamina. Share Your PPT File. Cyanophyceae reserve food in the form of cyanophycean or myxophycean starch. They reserve their food in the form of fat. ADVERTISEMENTS: F.E. They also contain large amount of a brown pigment, fucoxanthin, vhich masks green colour of chlorophyll pigments and that is why these algae appear brown in colour. F.E. The 1,500 species of brown algae are almost exclusively found in marine habitats. Algae are eukaryotic organisms and are capable of photosynthesis because they contain chloroplasts like plants. Laminaria and Ascophyllum have antibiotic properties, while Durvillea has worm expelling or vermifuge properties. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. Most algae require a moist or watery environment; hence, they are ubiquitous near or inside water bodies. The brown colour of algae is due to the presence of large amount of xanthophyll called fucoxanthin.

The female gametes are non-motile. Dinophyceae are motile, unicellular organisms. These Phycocolloids are complex polysaccharides that are reserved in the cell wall of algae, and protect them from desiccation and prevent drying or freezing (in winter) when exposed to air in low tide. The sexual reproductions are isogamous, anisogamous, and oogamous. Sex organs are borne in two different types of conceptacles. Laminaria is a source of food, manure, algin and iodine.
Brown algae are eukaryotic marine algae which possess chlorophyll a, chlorophyll c, abundant fucoxanthin, phycocolloid algin and reserve food in the form of laminarin. Potash is abundant in Macrocystis and Nereocystis. Examples: Nostoc, Oscillatoria, Anahaena, Lyngbya, Plectonema. It is phycocolloid which is obtained commercially from Laminaria, Macrocystis, Nereocystis, Fucus, Sargassum etc. Sexual reproduction ranges from isogamy to oogamy. Keep people and pets away from water that is green, scummy or smells bad. It is a ribbon shaped dichotomously branched marine brown alga that grows in shallow waters. Some common brown algae : A. Sargassum; B. Fucus. Euglenineae contain photosynthetic pigments such as chlorophyll a and b, β-carotenes, xanthophyll.


Frond is flat, dichotomously branched.

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