  We study marginally compact macromolecular trees that are created by means of
two different fractal generators. In doing so, we assume Gaussian statistics
for the vectors connecting nodes of the trees. Moreover, we introduce bond-bond
correlations that make the trees locally semiflexible. The symmetry of the
structures allows an iterative construction of full sets of eigenmodes
(notwithstanding the additional interactions that are present due to
semiflexibility constraints), enabling us to get physical insights about the
trees' behavior and to consider larger structures. Due to the local stiffness
the self-contact density gets drastically reduced.
