Abies balsamea 'Coerulescens' is a vigorous growing Balsam fir with needles very densely arranged, only .2 - .4 inches (6 - 10 mm) long, .08 inches (2 mm) wide, both sides with bluish stomatal lines.
Originated c.1865 by Seneclauze, France.
Alternate spelling 'Caerulescens' (RHS Encyclopedia of Conifer, 2012)