fungi- chapter 14. fungi eukaryotic unicellular and multicellular most are composed of hyphae...
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Fungi• Eukaryotic• Unicellular and multicellular• Most are composed of hyphae (fungal filaments)• Nuclei occur in continuous mycelium• Heterotrophic absorbers• Cell wall present and predominantly made of chitin• Reproduction is asexual and sexual• Life cycles are variable• Numbers- ~100,000 species described• Habitat- ubiquitous, but primarily terrestrial• Size- microscopic and macroscopic• Storage product- glycogen
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• Unikonts• Lack chitin• ~1000 species• Habitat- Soil, freshwater, and marine• Example- Rozella.
Phylum Cryptomycota
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Phylum Chytridiomycota• Aseptate.• ~800 species• Habitat
– Soil from desert, ditches, and banks of ponds and streams, rumen of large mammals
• Motile zoospores and gametes with a single whiplash flagellum
• Example- Allomyces• Sexual reproduction involves the
formation of a sporophyte• Asexual by zoospores
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Phylum Microsporidia
• Spore forming unicellular animal parasites
• ~1500 species
• Lack mitochondria, golgi, and peroxisomes
• Reproduce by forming spores that shoot polar tubes into host cells
• Example-
Microsporidium
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Phylum Glomeromycota
• Arbuscular endomycorrhizae
• 200 species so far
• Occur in about 80% of vascular plants
• Aseptate, coenocytic
• Asexual, large multinucleate spores
• Example- Glomus
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Phylum Zygomycota
• Aseptate• ~1000 species• Habitat
– Plant and animal tissue in soil, some are parasitic on plants, insects, and small soil animals
• Nonmotile.• Example- Rhizopus stolonifer
(common bread mold)• Sexual reproduction involves
the formation of a zygosporangium
• Asexual by nonmotile spores
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Phylum Ascomycota• Septate• ~32,000 species• Habitat
– Leaves, wood, plant fruit.• Nonmotile• Examples- Neurospora
(powdery mildew), Morchella (morel), Saccharomyces (yeast)
• Sexual reproduction involves the formation of asci on an ascocarp
• Asexual by budding, conidiospores, fragmentation
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Phylum Basidiomycota• Septate• ~22,000 species• Habitat
– Plant litter• Nonmotile• Examples- Agaricus
(mushroom), Puccinia (rusts), Ustilago (smuts)
• Sexual reproduction involves the formation of basidia on an basidiocarp
• Asexual by budding, conidiospores, fragmentation
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Lichens• Mycobiont and phycobiont• Mycobiont= part
Ascomycota & Basidiomycota
• ~13,000 species• Habitat
– From the desert to the poles
• Nonmotile• Examples- Caloplaca
(crustose), Parmelia (foliose), Usnea (fruticose)
• Reproduction is by fragmentation
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