Algae

• Taxonomy of Brown Alagae?

  Division Phaeophyta
• Green Alagae Taxonomy?


  Division Chlorophyta
• Taxonomy of Diatoms?


  Division Bacillariophtya
• Zygotic Meiosis: Only the zygote is a diploid cell, which divides into spores (n) the multicellular haploid organisms produce haploid gametes which combine to form a zygote
• Any multicellular stage in zygotic meiosis is haploid
• In gametic meiosis, the only haploid cell is the gamete, any multicellular stage is diploid
• All plants have alternation of generations (sporic meiosis)

  
• Cell walls in Division Phaeophyta contain cellulose and a mucilaginous intercellular substance called algin
• In an alga with gametic meiosis, gametes are produced in receptacles.
• Where are receptacles located and what do they do?

  Receptacles are found at the end of the branches, and multiple hollow chambers within the receptacles are conceptacles that produce gametes.
• Conceptacles contain oogonia (egg producing) and antheridia (sperm producing)
• Kelp 'roots' are called holdfasts
• Kelp 'stem' is stripe and 'leaf' is blade
• Kelp airbladders help hold blade near water surface
• Diatoms, Division Bacillariophyta

  
• Alternations of Generations

  
• Male conceptules

  
• Cell walls in the Phaeophyta contain cellulose and a mucilaginous intercellular substance called algin
• Unlike plants (but like animals), the life cycle of Fucus, a brown algae is termed gametic meiosis.
• Gametes are produced in areas called receptacles near the ends of branches on Fucus. There are numerous hollow chambers within the receptacle that are called conceptacles;
• Conceptacles contain gamete producing structures called oogonia (produce eggs) and antheridia (produce sperm).
• Kelps are normally differentiated into rootlike holdfasts, a stemlike stipe, and leaflike blades. There are commonly air bladders that float and help hold blades near the water surface.
• Kelp anatomy

  
• ls of kelp

  
• Green algae, division chlorophyta

  
• lives colonially

  
• Hydrodictyon, w.m. division chlorophyta

  
• Filaments of Oedogonium, Division Chlorophyta are attached to the substrate by a holdfast and they exhibit intercalary growth
• Division Chlorophyta

  A) oogonium

  B) antheridia

  
• Division Bacillariophyta