The following is extracted from: Low Elevation Mixed Species in Victoria's State Forests (2013)
Mixed species forests are widespread in Victoria, except for the north-west region. There is significant variation in the range of species involved, the soil types, elevations and climatic conditions under which these forests grow. Consequently, these forests are often referred to by a number of common names, usually based on climate or location, e.g. Dry and Lowland Sclerophyll, or Foothill and Coastal Mixed Species.
However, the division of Victorian mixed species forests into High Elevation Mixed Species (HEMS) and Low Elevation Mixed Species (LEMS) is most relevant for guiding silvicultural practices. Generally the LEMS forest type occurs in the foothills of the Great Dividing Range and in the near-coastal areas. High Elevation Mixed Species (HEMS) and Ash eucalypt species occur at higher and usually wetter sites.
The reference below:
Management of Mixed Species Forests - JD Kellas & RF Hateley (1989) is a good place to further your understanding of this forest type.