The Latin name is from the Japanese name for T. sieboldii. T. canadensis and T. heterophylla were discovered early (before 1800) and until 1855 were simply treated as species of Pinus, but in 1842 T. sieboldii, the southern Japanese hemlock, was described as Abies tsugae.
The brains of the cell, the nucleus directs cell activities and contains genetic material called chromosomes made of DNA.
1 Nucleus controls all the cellular activities of the cell. 2  Nucleolus is involved in synthesis of ribosomes. 3  Nucleus contains hereditary information of cell.  It is responsible for cell division (reproduction) and transmission of genetic information from parents to offspring.