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Ferns are widely distributed all over the world in warm,
moist and shady places. The main plant body of ferns is
sporophyte, which is differentiated into underground
stem called rhizome, roots and aerial shoots with leaves.
Ferns are homosporous (e.g., Dryopteris, etc.) or
heterosporous (e.g., Marsilea). Spores are born in the
sporangia which are grouped in sori. Some common
ferns are Dryopteris, Pteridium, Pteris, etc.