 have poorly defined growth rings, with isolated vessels arranged in radial multiples.Pitting between vessels is alternate and covered, and fibres are generally not divided by a septum.The axial (i.e., longitudinal) parenchyma varies from a winged shape to confluent, and is irregularly storied (i.e., layered), while the rays (perpendicular to growth rings) are of variable height and generally comprise a single or double cell width.