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
Bintulu Division do exist just to make presence. Other government offices have set up their branches in both Bintulu and Tatau district (some at Sebauh sub-district and other smaller communal areas) such as Royal Customs, Fire and Rescue Department, Education Department, etc. Bintulu Division Bintulu Division is one of the twelve administrative divisions of Sarawak, Malaysia. It has a total area of 12,166.2 square kilometres, and is the third largest division after Kapit Division and Miri Division. Bintulu Division consists of two districts which is Bintulu and Tatau, together with a sub-district under Bintulu, which is Sebauh. Three major towns in Bintulu