Bis2CF10.Lecture17

Bis2CF10.Lecture17 - Lecture 17 VASCULAR PLANTS: SEEDLESS...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture 17 VASCULAR PLANTS: SEEDLESS GROUPS Last: origin of vascular plants; “rhyniophytes” Lycophytes (clubmosses, etc.): microphylls Heterospory Pteridophytes: “megaphylls” in horsetails, ferns Next: origin of seed plants (spermatophytes) Early Devonian “rhyniophytes” Xylem terminal parenchyma Phloem epidermis with cuticle aerial stems stem cross-section rhizome rhizoids horizontal rhizomes Stomata Lycophytes Lycophytes Lycopodiella Huperzia Lycophytes sporangium sporophyll axil Huperzia Lycophytes sporangium sporophyll axil Sporophylls grouped into strobili (= cones) Early Devonian outgroups of lycophytes sterilized sporangium hypothesis Zosterophyllum Asteroxylon Rhynie Chert Early Devonian outgroups of lycophytes Angiosperm root lateral root root hairs root cap Asteroxylon Rhynie Chert Zosterophyllum Lycophytes Euphyllophytes Pteridophytes Seed plants Pine Fern Lycopodium roots axillary sporangia microphylls Psilotum Ophio. Equisetum “progymnosperms” Zosterophyllum lateral sporangia Aglaophyton typical tracheids branched sporophyte vascular tissue Selaginella Homospory (same spores) Lycopodium Heterospory (different spores) Longitudinal section of strobilus Selaginella HETEROSPORY microspores & male gametophytes megaspore & female gametophyte Selaginella HETEROSPORY New sporophyte microspores & male gametophytes Megaspore & female gametophyte megaspore & female gametophyte Fossil tree Lycophyta Lepidodendron Carboniferous equatorial rainforest, 310 MY Lepidodendron Isoetes Stomata Lycophytes Biflagellate sperm of lycophyte (Lycopodium) Multiflagellate sperm of fern (Psilotum) ORIGIN OF MEGAPHYLL “Rhyniophyte” overtopping unequal branching ancestor (lateral branch) planation branching in one plane Webbing marginal meristem Psilophyton Early Devonian early euphyllophyte Overtopping Psilophyton crenulatum Rootlike structures Psilophyton Early Devonian early euphyllophyte Overtopping Lycophytes Euphyllophytes Pteridophytes Seed plants Pine Fern Lycopodium roots axillary sporangia microphylls Psilotum Ophio. Equisetum “progymnosperms” Zosterophyllum lateral sporangia multiflagellate sperm overtopping roots Aglaophyton typical tracheids branched sporophyte vascular tissue Middle Devonian euphyllophytes Dichotomous appendage Calamophyton Ibyka Branch system with dichotomous appendages Rhacophyton Late Devonian Sphenophyllum Carboniferous Simple leaves with dichotomous veins Compound leaf with dichotomous leaflets Rhacophyton Late Devonian Sphenophyllum Dichotomous appendage Carboniferous Simple leaves with dichotomous veins Middle Devonian euphyllophyte Ibyka Branch system with dichotomous appendages Compound leaf with dichotomous leaflets Stomata Lycophytes Fern (Osmunda) Horsetail (Equisetum) Carboniferous horsetails Archaeocalamites & Calamites whorled leaves: microphylls branches Sphenophyllum Carboniferous horsetails Archaeocalamites & Calamites Calamophyton (Middle Devonian) Sphenophyllum Equisetum strobilus sporangium Calamophyton (Middle Devonian) sporangiophore ...
View Full Document

This note was uploaded on 04/19/2011 for the course BIOLOGY BIS 2C taught by Professor Doyle during the Fall '10 term at UC Davis.

Ask a homework question - tutors are online