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Green algae
The dominant plants of the Ordovician period were green marine algae. Algae moved onto land approximately 1.2 billion years ago, but multicellular land plants did not evolve until the Ordovician.
The first plants
It is thought that the first land plants evolved from algae in the mid-Ordovician. The evidence for this is the recent discovery of fossilized spores which are approximately 470 million years old.
Bryophytes
The first land plants were likely bryophytes, very primitive plants that have tissues and enclosed reproductive systems but produce neither seeds nor flowers and have no vascular tissues for transporting liquids. Because of this, bryophytes are generally small, low to the ground, and found mostly in moist areas. The plants of the Ordovician period may have resembled modern liverworts, a type of bryophyte.