24 Origin of Land Plants III

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

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Unformatted text preview: 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 Fiddleheads of the Ostrich Fern. Credit: © Brad Mogen/Visuals Unlimited Fiddlehead 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) True Fern 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 Fig. 23-20b, p. 420 sori Fern Sori 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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24 Origin of Land Plants III - Lecture 24 • Seedless...

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