Lecture 12 Tracheophytes- seedless vascular plants

Lecture 12 Tracheophytes- seedless vascular plants -...

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Lecture 12 Tracheophytes: seedless vascular plants Tracheophyte is a common name (not taxonomic ) A. Dominant and plants (compared to the bryophytes) 1. Vascular tissue - Xylem – support (grow tall so they can take full advantage of the sun) and transport of water - Phloem – sugar transport (like pipes; rapid transport) 2. Sporophyte dominant (2N) 3. Seedless – no independent protection of embryo - Seeds help protect the growing embryo so this is primitive 4. All require water for fertilization (primitive) - The sperm is flagellated (limits them to moist places) B. Rhyniophyta (all extinct at this point) 1. Rhynia (genus)(fig-27.18) - Extinct 2. No roots or leaves (just stems) 3. Underground stem is rhizome (horizontal and nonphotosynthetic); when the tops die down in the winter, the rhizomes are still alive underground (they are call herbaceous [soft] perennials [live year after year]); trees are perennial but not herbaceous - Arial stem is upright, photosynthetic (green), has sporangia (spores; sporophyte 2N); they
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