- Common name(s): Chocolate tube slime , Tree hair.
- Grow in clusters on rotting or dead wood.
- Inedible.
Stemonites from Myxomycetes class
Some of Phytomyxea species are plant parasites.
F/T?
F, most of phytomuxea
means “egg fungi” and refers to the large round oogonia, or structures containing the female gametes.
Oomycota
- water molds and downy mildews.
- are filamentous protists that must absorb their food from the surrounding water or soil
- role on decomposition and recycling of decaying matter
- parasitic species have caused much human suffering by destroying crops and fish.
Oomycetes
large non-motile gametes called
eggs
smaller gametes called
sperm
why oomycetes it’s belongs to the kingdom of Chromista?
Because of its biochemical and molecular structure, especially since its germs swimming by flagella
Why Saprolegnia called cotton molds?
because of the characteristic white or grey fibrous patches they form.
Saprolegnia filaments (hyphae) are ?
long with rounded ends containing the zoospores.
These are short hyphae that penetrate the substratum. They anchor the mycelium and absorb nutrition
Rhizoidal hyphae
are long hyphae that grow out from the surface of the substratum into the water and extend in all directions.
Extramatrical hyphae
Saprolegnia cause white rusts disease and are saprophytic feeding
T/F?
F, cause fish molds disease
Albugo: parasitical, causes white rusts disease
T/F?
T
- largest group of slime mold
- not known to cause sickness in humans
- slime molds are not plant parasites, they may injure plants by covering and shading them.
Myxomycetes
- found most frequently in fresh water; it will also tolerate brackish water and even moist soil.
- travels in colonies
- more prevalent in lower temperatures
- feeding on waste from fish or other dead cells
Saprolegnia
- infection is usually fatal, causing hemodilution.
- secondary pathogen
- role in the decomposition
Economic Importance of Saprolegnia
Phtytophthora causes late blight of potato
T/F?
T
- have characteristics of both molds and protozoa
- occur in decaying plant material.
Myxomycota
a multinucleate mass of cytoplasm(Ectoplasm -Endoplasm) don’t have a cell wall
• move in an Amoeboid movement during the search for nutrients.
• Feeding method : Phagocytosis
plasmodium
