By John C. Kricher
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Additional info for A field guide to California and Pacific Northwest forests
This is generally a weak branch union. Collar See Branch collar. Colloids The smallest mineral (clay) and organic (humus) particles in soil able to remain suspended for lengthy periods in pure water (Handreck & Black 2002, p. 44) and considered to have a correspondingly large surface area per unit of mass. Column boundary layer Interface between a column/s of dysfunctional discol- oured or decayed wood and sound wood; applicable to a reaction zone or a barrier zone (Lonsdale 1999, p. 312). Columnar roots See Column roots.
Condition A tree’s crown form and growth habit, as modified by its environ- ment (aspect, suppression by other trees, soils), the stability and viability of the root plate, trunk and structural branches (first (1st) and possibly second (2nd) order branches), including structural defects such as wounds, cavities or hollows, crooked trunk or weak trunk/branch junctions and the effects of predation by pests and diseases. These may not be directly connected with vigour and it is possible for a tree to be of normal vigour but in poor condition.
Degrees of crookedness can be categorised as Slightly crooked, Moderately crooked and Severely crooked. ) Crooked tree See Crooked. 35 Crossed branches/roots Crown density Crossed branches/roots Branches or roots forming a point of contact where they grow over each other. Such contacts may form a graft or a root graft, or may form a mechanical abrasion wound in branches subject to movement or a false graft in roots. Crossover See Vehicular crossover. Crotch The point on the inner side of a branch and trunk union or at the inner side of the union of two or more branches.