fungi
DESCRIPTION
Fungi. Premier Decomposers. Fungi Characteristics. Heterotrophic Secrete digestive enzymes on organic material and then absorb it Extracellular digestion and absorption. Fungi Characteristics. Most are multicellular Reproduce both asexually and sexually Spore producing - PowerPoint PPT PresentationTRANSCRIPT
Fungi
Premier Decomposers
Fungi Characteristics
• Heterotrophic• Secrete digestive
enzymes on organic material and then absorb it
• Extracellular digestion and absorption
Fungi Characteristics
• Most are multicellular• Reproduce both asexually and sexually• Spore producing• Produce a mesh of filaments called a
mycelium• Each filament of the mycelium is called a
hypha
Fungi Characteristics
• Three major groups:• Zygomycota• Ascomycota: sac
fungi• Basidiomycota: club
fungi• Imperfect fungi
Spores
• Sexual, asexual spores, or both• Depends on contact with other hyphae,
food availability, temperature, and dampness
• Incredible numbers of spores are produced
• Depend on wind and air currents to disperse them
Zygomycetes• Bread mold• Some parasitic
species• Stalked hyphae with
spore sacs on top
Ascomycetes
• Sac Fungi• 30,000 species• Includes truffles and
morels• Penicillium that
flavors cheeses and makes antibiotic
• Yeast
Ascomycetes
Basidiomycetes
• The club fungi• The typical mushroom
with a stalk and cap• Shelf and bracket
fungi• The mushroom is
really the reproductive body-the mycelium is buried
Basidiomycetes
Typical Life Cycle
Club Fungi Life Cycle
Imperfect Fungi
• Not really a classification group• Used when we cannot detect a sexual
phase of spore production• Often includes penicillium and aspergillus
Lichens
• Fungus intertwined with a photosynthetic organism
• Most of the fungi are sac fungi (Ascomycota)
• Most of the photosynthetic components are green algae
• The fungus is usually the larger part
Lichens
Mycorrhizae:mutualism between a fungus and a
young tree root
Some are Bad Guys
• Histoplamosis• Athletes foot• Ringworm• Plant diseases such as Dutch Elm
disease, blights, smuts, Chestnut blight