sentences:  Vessels first evolved during the dry, low periods of the Late Permian, in the horsetails, ferns and Selaginellales independently, and later appeared in the mid Cretaceous in gnetophytes and angiosperms.Vessel members are open  tubes with no end walls, and are arranged end to end  to operate as if they were one continuous vessel.Vessels allowed the same cross-sectional area of wood to transport much more water than tracheids.