Laburnum (golden chain tree) cuttings. These are also a few weeks old. Same method. The top cutting is a "mallet" cutting. It is a small branch. The base is trimmed with some remaining stem from the 2-year growth, trimmed. The bottom cutting is similar, pruned just below the junction with the previous years' growth. The middle cutting is just new wood. All have calloused and are forming roots. Some previous years' growth seems to work best. Small sample size of course. With these, some previous years' cambium seems to help.
Redmond American Linden. These have some callous. They leaked a jelly-like sap for a while. Not much. The root initials look promising. They are also in the "maybe" category, as to whether I'll get trees from them. If the tops grow too fast, they might overwhelm the almost embryonic roots.