BIOA02H3 Lecture Notes - Lecture 2: Gymnosperm, Welwitschia, Antheridium
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BIOA02H3 Full Course Notes
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Don"t have any woody tissue so we don"t have any fossilized evidence to tell when exactly. But we know when the rst lycophyte evolved, early palaeozoic times. Lycophytes ! conquering of dry land by vascular plants! Overall growth form is pretty primitive. main body pressed towards the ground and then branching up to photosynthesize but more to send out the branches supporting the sexual reproductive organs. 420 million years ago fossil shows those cellular structure and those three parts that are important. Life cycle of ferns:! groups under lycophytes :: spikemosses (700) - have biggest diversity in the tropics, clubmosses (400) - typically grow at forests, quillworts (150) - all live at the bottom of lakes! Evolved after lycophytes, somewhere in early carboniferous time period. All the coal we are burning today is all the fossilized plant material of lycophytes during the.
