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Fungi. Chapter 31. Plantae Fungi Animalia Protista. Monera. Kingdom Fungi. About 100,000 species. Uses: medicine food Ecological value: major decomposers symbiotic relationships (N 2 fixers) Problems: some strains are deadly athletes foot destroy library books

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Chapter 31


Kingdom Fungi

About 100,000 species

  • Uses:

    • medicine

    • food

  • Ecological value:

    • major decomposers

    • symbiotic relationships (N2 fixers)

  • Problems:

    • some strains are deadly

    • athletes foot

    • destroy library books

    • destroy crops

Some fungi are pathogens
Some fungi are pathogens

  • About 30% of the 100,000 known species of fungi are parasites, mostly on or in plants.

    • American elms:

      Dutch Elm Disease

  • American chestnut:

  • chestnut blight

Was once one of America's most dominant trees

Some fungi are pathogens1
Some fungi are pathogens

  • Other fungi, such as rusts and ergots, infect grain crops, causing tremendous economic losses each year.

Some fungi are pathogens2
Some fungi are pathogens

  • Curse of the Mummy

Kingdom Fungi

Eukaryotic, absorptive

Mostly multicellular (except few, e.g. yeast)

Heterotrophic (decomposers & parasitic)

Mycelium (body of hyphae)

Kingdom Fungi

  • Firm cell walls (generally of “chitin”)

  • “Spores” as reproductive bodies

  • Unique chromosomes and nuclei

  • Includes molds, yeasts, rusts, and mushrooms

  • hyphae - the vegetative bodies of most fungi, constructed of tiny filaments

  • mycelium -an interwoven mat of hyphae

Human hair

Fungal hypha

  • Ceonocytic hypha:

  • continuous cytoplasm mass

  • multinucleate

  • no septa


  • Modified hyphae found in parasitic fungi

  • Function: absorb nutrients from host

  • Some fungi even have hyphae adapted for preying on animals.

Kingdom Fungi

Division Chytridiomycota

Division Ascomycota

Division Glomeromycota

Division Basidiomycota

Division Zygomycota

Division Deuteromycota

Fig 31 11


25 µm

Chytrids (1,000 species)

Fungus-like protist

Fig. 31-11

Zygomycetes (1,000 species)

Fungal hypha

Glomeromycetes (160 species)

Ascomycetes (65,000 species)

Basidiomycetes (30,000 species)



Division chytridiomycota
Division Chytridiomycota reproductive features.

  • mainly aquatic.

  • Some are saprobes, while others parasitize protists, plants, and animals.

  • chitinous cell wall

  • flagellated zoospores

  • the most primitive fungi

Division Zygomycota reproductive features.

“Zygote fungi”(bread molds)

Zygote = “mated” hyphal strands

Live in soil, water

Some are parasites

600 species

Mated hyphal strands reproductive features.

  • The zygomycete reproductive features.Rhizopus can reproduce either asexually or sexually.

Phylum glomeromycota
PHYLUM reproductive features.GLOMEROMYCOTA

  • Previously With Zygomycota

  • Small Monophyletic Clade

  • Endomycorrhizae – Arbuscular Mycorrhizae

  • Produce branching Arbuscules

Fig. 31-15 reproductive features.

2.5 µm

Plant-Fungal Relationships reproductive features.

Mycorrhizae (“fungus roots”)

90% of tree species have this association

Very important to absorption of water and nutrients

Soil surface reproductive features.

Plant roots


Increases s.a. for absorption

Division Ascomycota reproductive features.

“Sac fungi”(truffles, yeast)

Beer > 6,000 years

Wine > 8,000 years


Decomposers, pathogens

“yeast” describes a form of fungi (i.e., non-hyphal)

60,000 species

Division Ascomycota reproductive features.

Scarlet cup



Division Ascomycota reproductive features.

Close up of cheese showing blue-green mycelium of Penicillium roqueforti.

Roquefort cheese

Yeast reproductive features.

LICHENS reproductive features.




Lichen reproductive features.

Lichen Anatomy reproductive features.

Division Basidiomycota stage during the formation of ascocarps.

“Club fungi”(mushrooms)

Club-shaped reproductive structure


Plant diseases

25,000 species

Fairy Ring stage during the formation of ascocarps.

PHYLUM DEUTEROMYCOTA long-lived dikaryotic mycelium.

No Longer Exist!!

  • 22,000 species.

  • No known sexual stage.

  • Saprophytic, parasitic and predatory.

  • Many produce conidia.

  • Most classified as Ascomycota.

  • Fusarium wilt of tomato, potato and cotton.

  • Athletes foot, ring worm

Division Deuteromycota long-lived dikaryotic mycelium.

  • “Imperfect fungi”(penicillin)

  • Unrelated group

    • Asexual

    • No info on sexual cycle

25,000 species

Penicillin long-lived dikaryotic mycelium.


now Ascomycota

Candida albicans long-lived dikaryotic mycelium.

“yeast infection”

Botrytis long-lived dikaryotic mycelium.: “Noble Rot”