This document discusses the evolution and classification of plants based on fossil evidence. It begins with an introduction to paleobotany, the study of plant fossils. The earliest plant fossils are blue-green algae from 3.1 billion years ago. Plants evolved from aquatic to land-dwelling forms, developing features like cuticles, vascular tissue and reproductive structures. Plant fossils are grouped into non-vascular and vascular categories, with the non-vascular division containing algae and fungi and the vascular division containing bryophytes, pteropsida and later gymnosperms and angiosperms. The document concludes that plant fossils are important for reconstructing paleoclimates and tracing the evolutionary history of plants.