User Review - Flag as inappropriate. The origin of the red algae has remained an enigma. Also called Rhodophyta, it is a distinctive species found in marine as well as freshwater ecosystems. Algae ponds can be built on relatively small parcels of land that are otherwise unsuitable for crops. The terrestrial habitat was colonized by the ancestors of modern land plants about 500 to 470 million years ago. o cell wall composition and structure. A brief description of some of the filamentous algae and seaweeds that have been used for feeding fish, as listed in Tables 1.1â1.3, is provided in the following subsections. There are variations in structure of fucoidans reported previously which include sulfated group at C-3 and presence of α(1â2) glycosidic bond. Recent molecular studies have indicated similarities between red and green plastids, which suggest that there was a single endosymbiotic origin for these organelles in a common ancestor of the rhodophytes and green plants. In some cases, these filaments are alternate life history stages of an alga of more complex thallus form. In asexual type of reproduction, no sex is involved and there is no fusion of any kind of gametes or cells. Primarily there are two methods of reproduction in plant, i.e., asexual and sexual. This type of reproduction is ⦠Algae biofuel is biodegradable. Algae flourish in all sorts of habitats, including waste water. Structure of fucoidans of algae origin have alternating α(1â3) and α(1â4) glycosidic bond on their oligosaccharide chain with sulfate group at C-4. Land plants (embryophytes) evolved from streptophyte green algae, a small group of freshwater algae ranging from scaly, unicellular flagellates (Mesostigma) to complex, filamentous thalli with branching, cell differentiation and apical growth (Charales).Streptophyte algae and embryophytes form the division Streptophyta, whereas the remaining green algae are classified as Chlorophyta. This book covers topics such as: evolution of sex and sexuality in algae; and, pigments in algae with their chemistry and the evolution of thallus in algae. However, these are some of the more prominent types: Red Algae. Algae are free-living, although some can form a symbiotic relationship with other organisms. The Historically the Rhodophyta were classified first as plants and later as the most ancient eukaryotic organisms. Origin of the Sporophyte: It is an established fact now that an alternation of independent gametophytic and sporophytic generations has been evolved in several independent lines among aquatic algae. â¢The current systems of classification of algae are based on the following main criteria: o kinds of photosynthetic pigments, o type or chemical nature of photosynthetic energy storage products o photosynthetic membranesâ (thylakoids) organization and other features of the chloroplasts. The streptophyte algae are a paraphyletic group of green algae, ranging from unicellular flagellates to morphologically complex forms such as ⦠ADVERTISEMENTS: Useful notes on the origin and evolution of sex in algae! David Hazlebeck â Global Algae Innovations . 1 Executive Summary . Today it is widely accepted that land plants (embryophytes) evolved from streptophyte algae, also referred to as charophycean algae. Simple filaments are abundant among the red algae. Types of Algae. Preview this book » What people are saying - Write a review. red algae, but Porphyridium is a common unicellular species found in many freshwater pools. o the presence or absence of flagella (as well as the number and John Lukas, Danielle Sexton â Harris Group . It is also thought that a migration from an aquatic to a land habit is not essential for the appearance of an alternation of generations. 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