Thanks again guys.
Matt, the ground texture is a double gradient with the attributes set as bitmaplus. So, it is a material, but it uses images for the textures.
Sorry pixelplucker, but I would never import sub-D models into A:M for any reason, A:M has the treez plugin for making trees.
BTW, both plugins (bitmaplus and treez) were created by Marcel Bricman, thanks Marcel.