Clip from NTB ref 29 page 63
FIGURE 45.-STEM BURL
A stem burl on an ash tree. Burls and large swollen areas - often called tumors - can be found on all northern hardwood species. The bark is usually intact.
Dissection shows very little defect is associated with burls like this-unless the bark is broken; then decay is often present. Wavy grain is usually found a short distance above and below these abnormal growths. The cause of these burls is not known.
A burl on an Eastern Hemlock in Old growth forest in PA.
Clip from NTB ref 29 page 66
FIGURE 48.-LARGE BURLS.
Large burls can be found on all northern hardwood species. This one is on a yellow birch. Very little defect is associated with these large burls as long as the bark is tight. Trees with burls like this are often found in clusters.
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John A. Keslick, Jr.