Lect06S2011 - Extant, Non-Seed Vascular Extant, Plants Two...

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Extant, Non-Seed Vascular Plants Extant, Non-Seed Vascular Plants Two clades : Lycophytes , Phylum: Lycophyta Pterophytes Pterophytes , (ferns and fern (ferns and fern allies): allies): Whisk ferns Whisk ferns Horsetails Horsetails
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Lycophyta Lycophyta Roots and leaves present! Leaves are microphylls.
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Psilotum Psilotum Enation Very similar in appearance to Aglaophyton . Leaf-like enations enations present (not (not leaves!) leaves!). Sporophyte dominant
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Rhizome : Roots absent. Sporangium Psilotum Psilotum
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Equisetum (Horsetail) Equisetum (Horsetail) Roots and leaves present. Leaves are microphylls. Terminal strobilus bearing sporangia.
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Coal Formation Coal Formation Artist conception of Carboniferous Period
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Coal Formation Coal Formation Lycophytes and Pterophytes dominant during Carboniferous Period 290-360MYA Forest of phyla known from fossils and in form of fossil fuel (coal) Extinct plants responsible for the coal deposits in North America and Europe.
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Evolution of Seed and Gymnosperms Evolution of Seed and Gymnosperms
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Gametophyte to Sporophyte Dominance Gametophyte to Sporophyte Dominance Changes that led to seed plants Thus, seed plants heterosporous!
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Evolution of the Seed: Evolution of the Seed: What is a seed? What is a seed?
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What is a Seed? Parent plants heterosporous. Structure containing a plant embryo and its food supply. Integument : Protective outer layer for seed. Seed retained by parent sporophyte. Seed has dormancy period.
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This note was uploaded on 08/09/2011 for the course BIOL 172 taught by Professor Huddleston,m during the Spring '08 term at University of Hawaii, Manoa.

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Lect06S2011 - Extant, Non-Seed Vascular Extant, Plants Two...

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