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
Motovilikha Plants Motovilikha Plants Motovilikha Plants (; ) is a Russian metallurgical and military equipment manufacturer. In 2016 Motovilikha Plants joined NPO Splav, a Rostec company. It is named after the former town of Motovilikha, where it's located, which in 1938 was amalgamated into the city of Perm. The town in turn was named after the eponymous river, a small Kama tributary. The plant was established in 1736, when Empress Anna ordered the establishment of a smelter to produce steel for the nearby factories that existed at the time, supplying steel blocks for the manufacture of rifles and guns. By the late