Areolar Tissue is loose connective tissue that consists of a meshwork of collagen, elastic tissue, and reticular fibres-with many connective tissue cells in between the meshwork of fibres. The fibres that form the mesh structure of areolar tissue include:
Normal growth rates for Emerald Green (Thuja occidentalis 'Smaragd') are between 6 to 12 per year once established and tapering off as they reach about 12' to 15'. I'd be suprised to see more than about 18 per year even in ideal conditions.
'Nigra', also known as 'Dark American', is a popular selection that keeps its deep green color all winter long; it grows 10-20 feet tall and 4-6 feet wide at maturity. 'Smaragd', also called 'Emerald Green', is finer textured and slower growing, reaching 10-15 feet tall and 3-4 feet wide.