Sub-division :- Algae

Class :- Chlorophyceae

Order :- Chlorococcales

Family :- Hydrodictyaceae

Genus :- Hydrodictyon



  • The thallus is a multicellular colony forming a net-like structure.
  • Colony is a hollow and sac-like or saucer-like (saccate), cylindrical network, closed at both the ends. 
  • The spaces of the reticulum are bound by five or six cells (this number varies between 3-10 cells) which form a pentagonal or hexagonal structure.
  • The cells are cylindrical. End walls are angular to facilitate the formation of a mesh. 
  • A cell has a large central vacuole. 
  • Cytoplasm lies towards the periphery.
  • Cells are multinucleate. The young cells are however, uninucleate. 
  • Cell is called a coenocyte because of its multinucleate nature and presence of large central vacuole. 
  • Young cells have zonate or entire chloroplast. Little mature cells possess reticulate chloroplast. However, during older stages chloroplast may assume discoid shape and diffuses throughout the cytoplasm. 
  • Chloroplast contains large number of pyrenoids.



  1. Sub-division– Algae
    1. Presence of a simple thallus.
    2. Chlorophyll present
    3. Cell wall made of cellulose.
  2. ClassChlorophyceae
    1. Presence of a definite nucleus
    2. Chloroplast present. grass green colour
    3. Presence of starch
    4. Reproductive structure motile and flagella equal in length.
  3. OrderChlorococcales
    1.  Cells mostly single; if united form non filamentous colonies of definite shape and size
    2. Cells uni- or multinucleate
    3. Asexual reproduction by zoospores or autospores,
    4. Sexual reproduction isogamous.
  4. Family Hydrodictyaceae
    1. Cells united to form coenobe
    2.  Reproduction by zoospores and biflagellate gametes.
  5. Genus Hydrodictyon
    1.  Coenobe a saccate reticulum
    2. Chloroplast reticulate or discoid
    3. Uni- or multinucleate coenocytic cells.



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