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
Biology11
DivisionPterophyta
Ferns
§
Plantdivisionincludesfernsandhorsetails
§
Mostcommoninmoistand/orshadyenvironments
§
Sporophyteisthedominantgeneration
§
Theleafofaferniscalledafrond.
§
Thesearecalledfrondstodistinguishthem
fromtheleavesoffloweringplants.
§ Sporophyteproducesrootsandathickundergroundstemcalleda
rhizome,afood-storageorgan.
§ Thefrondispartofthesporophytegenerationofferns.
§ Fernsporesforminastructurecalledasporangium.
§ Clustersofsporangiaformasorus.
§ Soriusuallyarelocatedontheundersidesoffronds.
Biology11
Horsetails
§
HorsetailsorscouringrushesarealsomembersofdivisionPterophyta
§
Ribbed,hollowstemswithcirclesofscalelikeleaves
§
Producesporesinstrobili
§
Mostgrowinwetareasorwhererootscangrowintowater