BIO 202 Lecture Notes - Lecture 12: Glossary Of Botanical Terms, Antheridium, Gametangium
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*fig 21-8 in textbook shows evolutionary tree of spore bearing plants. Lignin complex polymer that makes wood hard. Heterospory evolved multiple times among these plants. Lepidodendron abundant during carboniferous period, when many plants became fossilized and made up the coal we use today. Organ system composed of stem, roots and leaves. Started out as simple & smaller plants. First land plant to develop leaves on the sporophyte, referred to as microfils. Microfils developed as little flaps of tissue called enations. Once enations developed a singular vascular trace in them they became microfils. The other spore bearing vascular plants developed megafils instead. Protostele central core of vascular tissue. Siphonostele pith surrounded by vascular tissue. Pith made up of parenchyma, living cells with only one primary cell wall. Leaves when a leaf is made, a portion of the system is used to provide vascular tissue to the leaf. This will look different from different angles because it(cid:495)s 3d.
