11 C Fungus like protists ► Fungus like protists Heterotrophic, need moist environments Cell...

11 C Fungus like protists►Fungus like protists

Heterotrophic, need moist environments Cell walls of cellulose (not chitin) Motile Example: water molds & slime molds

1. Water molds- Phylum Oomycota► Aquatic members live on dead or decaying

organic matter (like dead fish)► Land members parasitize plants blights

(crop loss)► Ex. Irish Potato famine (1845-1847) Ireland’s

population 8mil to 4 mil go to USA

► Asexual reproduction: sporangia produce zoospores that swim away

► Sexual reproduction: sperm and ova with fertilization tubes

2. Slime molds – (DECOMPOSERS!)► 2 phased life cycle-

feeding phase – mold looks like amoeba, eats bacteria & organic matter (slimy white/yellow/red mass)

Reproductive phase - fruiting bodies produce spores

2. Slime molds- cont’d►A. Phylum Acrasiomycota – cellular slime

molds Amoeba like, unicellular, crawl in moist

areas decomposing When food scarce – gather together into

colony (called pseudoplasmodium) looks like slimy slug forms fruiting bodies

2. Slime molds- cont’d►B. Phylum Myxomycota

– cellular plasmodial slime molds Plasmodium is multinucleate – cells all come

together and cell walls dissolve, creeps like a blob & phagocytizes organic matter

When food is scarse fruiting body form sspores haploid cells emerge fuse do mitosis without cytokinesis new plasmodium