There are about 35,000 species of freshwater and terrestrial algae, but many more remain to be described. Among them, 6,793 species are found in the Class Florideophyceae. Class: Phaeophyceae Order: Laminariales Family: Laminariaceae Genus: Macrocystis Species: pyrifera. ... Class: Bacilli Order: Bacillales Family: Bacillaceae Genus: Bacillus Species: alcalophilus. The phylum is Rhodophyta, which in turn is divided into two sub-phylum: Cyanidiophytina and Rhodophytina. 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. Phylum: Firmicutes This organism causes the Red Tide when it grows unchecked. Monostroma is only one cell layer thick while Sea Lettuce is two cell layers thick. Darrell Gulin / Getty Images. Also similar to other Ulva species. 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). Examples: Chlorella, Chlamydomonas, Spirogyra, Ulva. Classification. Red algae belong to the class Rhodophyceae under the phylum Rhodophyta which is one of the largest phylum of algae. By far the largest diversity is in diatoms, desmids, green and blue-green algae. Seaweed, any of the red, green, or brown marine algae that grows along seashores. • 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 Food reserves are starch, some fats or oils like higher plants. Chlorophyta: Green Algae. 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. Red and brown algae are particularly poorly represented in freshwater environments. 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 red seaweed belong to the Plantae Kingdom, however, since they are complex organisms with a large variety; there are doubts in this regard. Classification of Red Seaweed. Brown seaweeds are not close relatives of red and green seaweeds, although they are macroscopically similar and live mixed together on rocky shores. 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. But , they remain in this classification so far. It is the largest seaweed. 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). 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. Most of the algae are multicellular and marine algae (seaweeds). This phylum contains over 7000 recognized species. Phylum: Chlorophyta (Green Algae) Previous names: Similar species: Easy to confused with Monostroma. 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