  We present the z = 0.3 - 0.7 cluster X-ray luminosity function (XLF)
determined from the Southern SHARC (Serendipitous High-redshift Archival ROSAT
Cluster) survey. Over the luminosity range L ~ (0.3 - 3) x 10^44 erg/s (0.5 -
2.0 keV) the XLF is in close agreement with that of the low redshift X-ray
cluster population. This result greatly strengthens our previous claim of no
evolution of the cluster population, at these luminosities, at a median
redshift of z =0.44.
