  We analyze the quark spectral function above the critical temperature for
deconfinement in quenched lattice QCD using clover improved Wilson fermions in
Landau gauge. We show that the temporal quark correlator is well reproduced by
a two-pole approximation for the spectral function and analyze the bare quark
mass dependence of both poles as well as their residues. In the chiral limit we
find that the quark spectral function has two collective modes which correspond
to the normal and plasmino excitations. At large values of the bare quark mass
the spectral function is dominated by a single pole.
