Phylum Phaeophyta

Phylum Phaeophyta - gas. Laminaria is a kelp found in the...

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Phylum Phaeophyta: the Brown Algae The phylum Phaeophyta, commonly referred to as the brown algae , are a group that is entirely multicellular. All of its members also have the accessory pigment fucoxanthin (a brown pigment that gives the group its name) and stored sugar as the carbohydrate laminarin. The chloroplasts contain both chlorophylls a and c . Members of the group include the giant kelp that can be over 100 meters long. Brown algae are used in foods, animal feeds, and fertilizers and as a source for alginate, a chemical emulsifier added to ice cream, salad dressing, and candy. Brown algae also provide food and habitat for marine organisms, as witnessed by the great biodiversity found among the kelp "forests" off the California coast. Fucus is a brown alga differentiated into a floating "blade", flotation bladder, stalk (or stipe) and basal holdfast. Sargassum , common in the Sargasso Sea region of the Atlantic Ocean, floats and maintains position by a flotation bladder filled with
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Unformatted text preview: gas. Laminaria is a kelp found in the intertidal zone. It is unique among protists because it has tissue differentiation. . Phylum Oomycota: the Water Molds The phylum Oomycota includes the water molds with about 580 species. As indicated by the name, once this group was considered to belong to the fungi. Aquatic water molds parasitize fishes, forming furry growths on their gills. Some terrestrial water molds parasitize insects and plants; water mold was responsible for Irish potato famine. The body of water molds is filamentous, although cell walls are largely composed of cellulose (fungi have chitin in their cell walls). During asexual reproduction, they produce diploid motile spores (2n zoospores; most fungi lack motile spores). Unlike fungi, the adult phase of the life cycle is diploid, producing gametes by meiosis. Eggs are produced in enlarged structures known as oogonia....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Phylum Phaeophyta - gas. Laminaria is a kelp found in the...

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