USDA Forest Service
| 8 Images of 3 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5048017 | weak branch union | ||
| 5048018 | weak branch union | ||
| 5048023 | weak branch union | ||
| 5048030 | weak branch union | ||
| 5048052 | weak branch union | Poor branch attachment architecture in American elm | |
| 5048020 | included bark | Codominant branches with a long crack | |
| 1270006 | shear crack | codominant stems often reslut in a cracked trunk as the result of a weak branch union | |
| 1397071 | included bark | Codominant stems in eastern white pine. These stems are very prone to failure from pressure exerted by included bark. |


