BIOL 1020 Lecture Notes - Vascular Plant, Vascular Tissue, Non-Vascular Plant
Document Summary
Origin of vascular plants: bryophytes were prevalent for first 100 million years of plant evolution, vascular plants originated in the silurian and underwent great diversification during the. Devonina and carboniferous periods (dominant types of plants: vascular plants now dominant non-vascular plants, greater bio mass today, paraphyletic group, early vascular plants, 425 millions years ago, tiny, independent, branching sporophytes, living vascular plants have . Well-developed roots and leaved: early vascular plants lacked roots. Lycophytes: club mosses (not true mosses, spike mosses (not true mosses, quillworts. Pterophytes: ferns, horsetails, whisk ferns, flagellated sperm, and are usually restricted to moist environments (not as seriously as the bryophytes) Leaves: organs that increase the surface area of vascular plants, leaves are categorized by two types. Microphylls: leaves with a single vein (early devonian: figure 29. 13: hypothesis of evolution: vascular tissue -> sporangia -> microphyll. Megaphylls: leaves with a highly branched vascular system (late devonian: figure 29. 14: webbing betweent he veins.
