Four main groups of Land Plants. Bryophytes (mosses, etc.) Ferns and relatives Gymnosperms Angiosperms. Bryophytes. There are three groups of bryophytes Mosses 12,000 species Liverworts 6,500 species Hornworts 100 species. Bryophyte diversity. Hornworts 100 species.
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Bryophytes (mosses, etc.)
Ferns and relatives
Liverworts 6,500 species
Mosses - 12,000 species
Widely distributed, especially in alpine, boreal,
temperate, and tropical forests
Able to live in very dry or very cold habitats
Many can dry out entirely, then rehydrate
Wetland moss -
Boggy regions dominated by it known as peat bogs or peatlands
Gametophytes only a few cells thick. No true “leaves”.
Directly absorb water & minerals.
No lignified vascular tissue.
Close to the ground.
Anchored by rhizoids.
Long, tubular single cells - not tissues.
1) Basal foot
Spores produced in capsule (sporangium)
Spores released to germinate into gametophytes.
First vascular plants originated about 420 mya.
First seed plants came later about 360 mya.
Seedless vascular plants dominated the planet during the Carboniferous period (300-350 mya).
Dominant generation: sporophyte