Nonvascular Plants and Seedless Vascular Plants

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Nonvascular Plants and Seedless Vascular Plants

• BSC 2011L

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Plants

• Domain Eukarya
• Kingdom Plantae
• Bryophytes - nonvascular seedless plants
• Phylum Hepatophyta Liverworts
• Phylum Anthocerotophyta Hornworts
• Phylum Bryophyta Moss
• Vascular Seedless Plants
• Phylum Lycopodophyta Club Moss
• Phylum Monilophyta Wisk fern
• Phylum Monilophyta Horsetails
• Phylum Monilophyta Ferns

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Evolutionary relationships of plants

• Review Fig 16.1

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Alternation of Generations

• Sporophyte Generation
• Produces haploid spores by meiosis
• Gametophyte Generation
• Produces gametes by mitosis

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Nonvascular Seedless Plants

• Mosses, liverworts, and hornworts
• Gametophyte generation is dominant
• Produces eggs in archegonia
• Produces flagellated sperm in antheridia
• Rely on water source for reproduction

Notice the gemmae cups In this liverwort
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Nonvascular Seedless PlantsMoss Life Cycle
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Vascular Seedless Plants

• Whisk ferns, club mosses, horsetails, and ferns
• Sporophyte generation is dominant
• Adaptations for living on land
• Vascular tissue
• Windblown spores

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Vascular Seedless PlantsFern Life Cycle
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What is a Thallus?

• Body of a lower plant that has no recognizable
  shoot, root, or leaf regions
• Fern prothallus - gametophyte

Young sporophyte emerging from prothallus
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Vascular Seedless PlantsCross Section of Frond
Leaflet

• Sporophyte Generation
• Look at Figure 16.15
• The sorus contains the sporangium where the
  spores are produced