Unlike modern conifer forests, which block most of the light and have very little ground cover, the leaves of these trees were so slim they let a great deal of light through allowing for a layer of secondary growth. Other abundant types of plant life were:the Bryophytes, including the first true moss, Lycopsida; Sphenopsida, represented today by the horsetail or scouring rush; Pterophyta and Filicates, the preferns and the true ferns; and Pteridospermophyta, the seed ferns (one of the links between ferns and gymnosperms).