Classification of pteridophytes By Aprajita shankhdhar
. The pteridophytes are further classified into four classes: . Psilopsida (Psilotum) Lycopsida (Selaginella, Lycopodium) Sphenopsida (Equisetum) . Pteropsida (Dryopteris, Pteris, Adiantum)
Psilophyta (whisk ferns . Most primitive land plants Body is very simple with green upright branches and an underground stem - rhizome. . Roots and true leaves are absent These plants grow in warmer parts of the world . Psilotunm
Division ...Lycopodophyta . Club moss . Small and grow close to ground in forest . The cones are produced near the tips of branches The plants grow abundantly in mountainous part . Lycopodium, selaginella
Division.. .Equisetophyta Strobilus Horse tails Hollow jointed, uprighted branches which grow up from underground Stem Leaves are not large and green Whorls of small scale leaves develops from node on branches. Produces sporophylls that are organised in cones The cone develop at the tips of some of the upright branches Equisetum Scale
Division...Filicophyta (Ferns True ferns Ferns have underground stem which produce leaves above ground. . On lower surface of leaves small brown dots are seen. These are sori which are group of sporangia containing spores Adiantum , Pteris, Nephrolepis
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