24 Origin of Land Plants III - Lecture 24 Seedless Vascular...

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Lecture 24 Seedless Vascular Plants Monilophytes True Ferns (Continued) Origin of seeds Introduction to seeds What is a seed? Seed origins Precursor: Progymnosperms Existing Seed Phyla Pollen and Pollination Life Cycle of a Pine
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Fiddleheads of the Ostrich Fern. Credit: © Brad Mogen/Visuals Unlimited Fiddlehead
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Fig. 23-CO (a), p. 401 strongly lignified vascular tissue True ferns Horsetails Marattialean ferns Ophioglossalean ferns Whisk ferns Seed plants Lycopodium group Isoetes Selaginella Bryophytes (Lepidodendrids) (Zosterophyllophyta) heterospory (in some) heterospory heterospory (Rhyniophytes) Lycophytes Monilophytes--ferns (Aglaophyton) leptosporangia (Other Rhyniophytes) reduced gametophyte (Rhynia) heterospory (in some) megaphylls lignin branched, independent sporophyte (xylem and phloem) chloroplast DNA inversion Tracheophytes or Seedless Vascular Plants (SVPs)
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True Fern
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Staghorn Fern ( Platycerium bifurcatum ), Polypodiaceae. This plant is an epiphyte, a plant that grows attached to another organism, but derives no nourishment from it. East Australia. Credit: © Kjell Sandved/Visuals Unlimited Staghorn Fern
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Fig. 23-20b, p. 420 sori Fern Sori
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True Ferns Underground rhizomes. All we typically see are leaves. Typically homosporous Distinguished from other ferns by unique sporangia: leptosporangia develop from a single cell have a long thin stalk thin wall that is one cell thick.
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