21.3 Seedless Vascular Plants - Weebly
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Biology 11 21.3 Seedless Vascular Plants Diversity of Seedless Vascular Plants § Seedless vascular plants have vascular tissues for transporting water and nutrients. § Because they have vascular tissues, seedless vascular plants generally are larger and better adapted to drier environments than nonvascular plants. § Seedless vascular plants reproduce using spores rather than with seeds. Division Lycophyta § Sporophyte generation of lycophytes is dominant. § Reproductive structures produce spores that are club-shaped or spike-shaped. § Have roots, stems, and small, scaly, leaf like structures § Many tropical lycophytes are epithytes (lives anchored to another object or plant) § Two genera: Lycopodium and Selanginella
Transcript of 21.3 Seedless Vascular Plants - Weebly
Biology11
21.3SeedlessVascularPlants
DiversityofSeedlessVascularPlants
§ Seedlessvascularplantshavevasculartissuesfortransportingwaterandnutrients.
§ Becausetheyhavevasculartissues,seedlessvascularplantsgenerallyarelargerand
betteradaptedtodrierenvironmentsthannonvascularplants.
§ Seedlessvascularplantsreproduceusingsporesratherthanwith
seeds.
DivisionLycophyta
§ Sporophytegenerationoflycophytesisdominant.
§ Reproductivestructuresproducesporesthatareclub-shapedor
spike-shaped.
§ Haveroots,stems,andsmall,scaly,leaflikestructures
§ Manytropicallycophytesareepithytes(livesanchoredtoanotherobjectorplant)
§ Twogenera:LycopodiumandSelanginella
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DivisionPterophyta
Ferns
§ Plantdivisionincludesfernsandhorsetails
§ Mostcommoninmoistand/orshadyenvironments
§ Sporophyteisthedominantgeneration
§ Theleafofaferniscalledafrond.
§ Thesearecalledfrondstodistinguishthem
fromtheleavesoffloweringplants.
§ Sporophyteproducesrootsandathickundergroundstemcalleda
rhizome,afood-storageorgan.
§ Thefrondispartofthesporophytegenerationofferns.
§ Fernsporesforminastructurecalledasporangium.
§ Clustersofsporangiaformasorus.
§ Soriusuallyarelocatedontheundersidesoffronds.
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Horsetails
§ HorsetailsorscouringrushesarealsomembersofdivisionPterophyta
§ Ribbed,hollowstemswithcirclesofscalelikeleaves
§ Producesporesinstrobili
§ Mostgrowinwetareasorwhererootscangrowintowater
