First land plants • Bryophytes: mosses & liverworts – non-vascular • no water transport system • no true roots – swimming sperm • flagellated sperm – lifecycle dominated by haploid gametophyte stage • fuzzy moss plant you are familiar with is haploid – spores for reproduction • haploid cells which sprout to form gametophyte diploid haploid Where must mosses live?
haploid. diploid. First land plants. Bryophytes: mosses & liverworts non-vascular no water transport system no true roots swimming sperm flagellated sperm lifecycle dominated by haploid gametophyte stage fuzzy moss plant you are familiar with is haploid spores for reproduction - PowerPoint PPT Presentation
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First land plants• Bryophytes: mosses & liverworts
– non-vascular• no water transport system• no true roots
– swimming sperm• flagellated sperm
– lifecycle dominated by haploid gametophyte stage• fuzzy moss plant you are
familiar with is haploid– spores for reproduction
• haploid cells which sprout to form gametophyte
diploidhaploid
Where mustmosses live?
Bryophytes: mosses & liverworts
Peat Bog“Peat Moss”
First vascular plants• Pteridophytes: ferns
– vascular• water transport system• xylem, phloem, roots, leaves
– swimming sperm• flagellated sperm
– life cycle dominated by sporophyte stage• leafy fern plant you are familiar
with is diploid• fragile independent
gametophyte (prothallus)– spores for reproduction
• haploid cells which sprout to form gametophyte
diploid
Where mustferns live?
haploid
Pteridophytes: FernsSelaginella Psilotum
Horsetails Ferns
Alternation of generations• Fern gametophyte (1n)
– small haploid plant which produces gametes– homospory: male & female on same plant
archegonia
antheridia
diploid
Alternation of generations
haploid
produces male & female gametes
archegonia
antheridia
Early Pteridophytes: Tree Ferns
Carboniferous forest – 290-350 myaForests of seedless plants decayed into deposits of coal & oil