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06_01_Saprolegnia
A mix of Saprolegnia asexual and sexual stages-no map 

06_02_Saprolegnia
Saprolegnia showing a zoosporangium and a septum Septum  Zoosporangium

06_03_Saprolegnia
A Saprolegnia zoosporangium Vegetative hyphus Septum  Zoosporangium

06_04_Saprolegnia
Saprolegnia antheridium and oogonium Vegetative hyphus Oogonium Oogonium with zygotes called oospores Vegetative hyphus Antheridium Vegetative hyphus Vegetative hyphus

06_05_Saprolegnia
A Saprolegnia oogonium containing zygotes (called oospores) Oospore Oospore Oospore Oospore

 

Originally, there were two subsections in the Protist (a/k/a Protoctista) kingdom: the Phylum_Protozoa (the animal-like protists) and the Division_Algae (the plant-like protists). Both groups were previously members of the animal and plant kingdoms, respectively. When you study zoology and botany, these groups will be included in the review of the animal and plant kingdoms. Since the early days of the Protist kingdom in the 1800’s a few more groups have been added to the kingdom, including the fungus-like (slime_molds and water_molds) protists.

Saprolegnia is an example of a water_mold. Water molds have a superficial resemblance to fungi (sing: fungus) because they have a mycelium (pl: mycelia) composed of coenocytic_hyphae. Their body, however, is technically one huge multinucleate cell. Some have chitin in their cell walls. Others lack chitin and have cellulose instead. Some species have both chitin and cellulose. They have a cycle of alternation_of_generations and most are decomposers. Their group includes the causative agent of the Irish_potato_blight (Phytophthora_infestans) as well as Saprolegnia.

Oogonia (sing: oogonium) and antheridia (sing: antheridium) will develop from separate hyphae (sing: hyphus), then fuse to form a zoosporangium (pl: zoosporangia). A septum (pl: septae) is a dividing wall (cross wall) in hyphae.