  We report the results of computer simulations of epitaxial growth in the
presence of a large Schwoebel barrier on different crystal surfaces: simple
cubic(001), bcc(001), simple hexagonal(001) and hcp(001). We find, that mounds
coarse by a step edge diffusion driven process, if adatoms can diffuse
relatively far along step edges without being hindered by kink-edge diffusion
barriers. This yields the scaling exponents alpha = 1, beta = 1/3. These
exponents are independent of the symmetry of the crystal surface. The crystal
lattice, however, has strong effects on the morphology of the mounds, which are
by no means restricted to trivial symmetry effects: while we observe pyramidal
shapes on the simple lattices, on bcc and hcp there are two fundamentally
different classes of mounds, which are encompanied by characteristic diffusion
currents: a metastable one with rounded corners, and an actively coarsening
configuration, which breaks the symmetry given by the crystal surface.
