Moisture loving plants. Reproduced by means of spores . Requires moist habitat. Continued and thrived in Carboniferous. The large lycopod trees became extinct by the end of the Paleozoic.
Plant roots begin to stabilize the soil against erosion.
First Seeds appeared in the Devonian Seed-bearing plants appeared. Seed-bearing plants no longer require moist habitats. Thi permitted the expansion of plants into drier areas. Paleozoic Era, Mississippian Period Contains abundant limestone. Well-exposed along Mississippi River Valley.