Most of the algae are multicellular and marine algae (seaweeds). Monostroma is only one cell layer thick while Sea Lettuce is two cell layers thick. By far the largest diversity is in diatoms, desmids, green and blue-green algae. Brown algae, from the phylum Phaeophyta (meaning "dusky plants"), is the most prevalent type of seaweed.Brown or yellow-brown in color, brown algae are found in the waters of both temperate or arctic climates. The brown algae are represented by about 1,780 species, currently classified in the class Fucophyceae (or Phaeophyceae) of the phylum Ochrophyta (De Reviers et al., 2007); the class includes 17 orders. It is the largest seaweed. How many species of freshwater and terrestrial algae are there? Monostroma grows in a circle around a disc-shaped holdfast; Sea Lettuce has a short stipe growing up out of the holdfast. Among them, 6,793 species are found in the Class Florideophyceae. ... Class: Bacilli Order: Bacillales Family: Bacillaceae Genus: Bacillus Species: alcalophilus. But , they remain in this classification so far. • The standard botanical classification system is used in the systematics of the algae: Phylum (Division) – phyta Class – phyceae Order – ales Family – aceae Genus Species 31 Classification of Red Seaweed. Red and brown algae are particularly poorly represented in freshwater environments. Green seaweeds.. Characteristics: Green colour from chlorophyll a and b in the same proportions as the 'higher' plants; beta-carotene (a yellow pigment); and various characteristic xanthophylls (yellowish or brownish pigments). Seaweeds are generally anchored to the sea bottom or other solid structures by rootlike ‘holdfasts,’ which perform the sole function of attachment and do not extract nutrients as do the roots of higher plants. Class: Phaeophyceae Order: Laminariales Family: Laminariaceae Genus: Macrocystis Species: pyrifera. Food reserves are starch, some fats or oils like higher plants. Chlorophyta: Green Algae. Seaweed, any of the red, green, or brown marine algae that grows along seashores. The red seaweed belong to the Plantae Kingdom, however, since they are complex organisms with a large variety; there are doubts in this regard. They are commonly known as brown algae, due to the presence of a golden brown xanthophyll pigment, fucoxanthin (C 40 H 54 O 6) in the chromatophores. Darrell Gulin / Getty Images. Brown seaweeds are not close relatives of red and green seaweeds, although they are macroscopically similar and live mixed together on rocky shores. Phylum: Firmicutes This organism causes the Red Tide when it grows unchecked. • The major groups of algae have been classified into Divisions (the equivalent taxon in the zoological code was the Phylum). Description of Phaeophyceae (Brown Algae): It is a large group of algae consisting of 240 genera and over 1,500 species out of which 32 genera and 93 species are reported from India. They belong to three different groups with over 10,000 species: brown algae (phylum Ochrophyta, class Phaeophyceae), red algae (phylum Rhodophyta), and green algae (phylum Chlorophyta, classes Bryopsidophyceae, Chlorophyceae, Dasycladophyceae, Prasinophyceae, and Ulvophyceae). Red algae belong to the class Rhodophyceae under the phylum Rhodophyta which is one of the largest phylum of algae. This phylum contains over 7000 recognized species. Also similar to other Ulva species. Examples: Chlorella, Chlamydomonas, Spirogyra, Ulva. Classification. There are about 35,000 species of freshwater and terrestrial algae, but many more remain to be described. Phylum: Chlorophyta (Green Algae) Previous names: Similar species: Easy to confused with Monostroma. 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