Evolutionary history of plants phloem on the outside. Since xylem cells comprise dead, lignified tissue, subsequent rings of xylem are added to those already present, forming wood. The first plants to develop secondary growth and a woody habit, were apparently the ferns, and as early as the Middle Devonian one species, "Wattieza", had already reached heights of 8 m and a tree-like habit. Other clades did not take long to develop a tree-like stature. The Late Devonian "Archaeopteris", a precursor to gymnosperms which evolved from the trimerophytes, reached 30 m in height. The progymnosperms were the first plants to develop true wood, grown from
Division of Diamond Valley Liberal Party, reflected in the current situation in which Jagajaga is a Labor seat and Menzies a Liberal seat. Division of Diamond Valley The Division of Diamond Valley was an Australian Electoral Division in Victoria. The division was created in 1969 and abolished in 1984. It was named for the Diamond Creek area. It was located in the north-eastern suburbs of Melbourne, including Doncaster, Watsonia, Eltham and Templestowe. With the expansion of the Parliament in 1984, the Division was effectively split in two, the western half forming the new Division of Jagajaga, and the eastern half the Division of Menzies.