OEB 52 2-25.docx

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Department
Organismic and Evolutionary Biology
Course
Organismic and Evolutionary Biology OEB 52
Professor
Elena Kramer
Semester
Spring

Description
Rise of the sporophyte Liverworts, hornworts, mosses, lycophytes Lycopsida Main characters Dichotomous or pseudonmonopodial branching Refers to equal branching Microphyll – start with unvascularized leaves, and overtime the become larger, become  vascularized, giving rise to a leaf with a single vein. Really just describing a leaf of a lycopod Pith = living parenchyma. Xylem preserves well in fossil record so people interested in classifying  them Lycopods show actinostele and plectostele. Protoxylem starts developing first, then metaxylem, with phloem in between the metaxylem.  Other thing that’s new here are the roots. In lycopods, where shoot goes up, root will emerge and  start to branch dichotomously. We don’t see dichotomous branching in angiosperms – it’s just  something that these meristems do.  A) shows how a fern branches, with recruitment of a meristematic cell B) shows lycopod root dichotomous branching What’s weird for this plant is when shoots branch, they also form a root that grows down the stem  and emerge closer to base of upright shoot Homospory vs Heterospory Homospory – all sports are the same, each spore germinate and produce bisexual gametophyte  (but may  not be self fertile) Heterospory – spores not equivalent, and produced by separate sporangia. Microspores give rise to  micr
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