2Fungi are eukaryotic heterotrophs that digest food externally and absorb the the digested materials through their body walls.Most fungi, including molds and mushrooms, are multicellular and macroscopic. Yeasts, though, are unicellular and microscopic.
3Fungi are classified by the way they produce sexual spores. Like plants, fungal cells have walls, but these walls are made of chitin, not cellulose.Fungi are classified by the way they produce sexual spores.
4Hyphae are the basic structure of threadlike filaments that grow from a fungal spore. Hyphae grow into a mycelium – a cottony mass covering and distributed within whatever the fungus is feeding on.
5Inside the hyphae are cross walls called septa Inside the hyphae are cross walls called septa. Within the septa there can be one to many nuclei depending on the species.Cytoplasm flows through pores in the septa
6This is a cross-section of hyphae. It shows septa, pore and cytoplasm.
9Fungi are heterotrophs. Most are saprobes, decomposing dead organisms.
10Some fungi have symbiotic relationships with other organisms. Parasitic fungi absorb nutrients from their host through specialized hyphae called haustoria.
11Lichens are among the most fascinating organisms on this planet Lichens are among the most fascinating organisms on this planet. Their very structure is unique: a symbioses of two organisms -- a fungus and algae -- so complete that they behave and look like an entirely new being. A lichen can literally eat stones, survive severe cold, and remain dormant for long periods without harm. What type of relationship is this?
24Rhiziods which grow down to anchor the mycelium to the food source. Phylum Zygomycota has stolons which grow horizontally across the surface of the food source and produceRhiziods which grow down to anchor the mycelium to the food source.This is the site of most extracellular digestion and absorbtion.
25Phylum Zygomycota is characterized by zygospores – thick walled spores capable of withstanding unfavorable conditions.
26Phylum Ascomycota are commonly called “sac fungi.”
27Phylum Ascomycota is characterized by ascospores – sexual spores produced inside an Ascus – a saclike structure in which ascospores are produced.
28This phylum also has conidiaspores asexual spores produced in conidia.
29Phylum Basidiomycota is also the “Club Fungi”. It is characterized by basidia – club shaped hyphae that produce basidiaspores during sexual reproduction.