External Wood Features		lo-res links (if internet is slow)
Curtis, Lersten, and Nowak 2002 rev. 2019

Pine (Pinus tight knot.

Pine (Pinus wood showing dwarf branch tight knots.

Pine (Pinus wood tight knot.

Pine (Pinus board with tight knots.

Pine (Pinus board with showing pith of trunk and a side branch.

Pine (Pinus board with two lateral branch tight knots.

Pine (Pinus board with pith in both main stem and lateral branch, and also dwarf branch knots.

Pine (Pinus board showing dwarf branch knots.

Pine (Pinus board with pit and dwarf branch bud knots.

Pine (Pinus transition from tight to loose knot.

Pine (Pinus loose knot.

Pine (Pinus loose knot.

Pine (Pinus loose knot.

Loose knot in Pine (Pinus.

Pine (Pinus loose knot (the hole).

Cross section of non-porous woods, from top: western hemlock (Tsuga heterophylla), scrub pine (Pinus virginiana), white fir (Abies concolor, and redwood (Sequoia sempervirens.

Woody oak (Quercus) stem cross section.

Wood block showing cross, radial, and tangential sections.