The Flisch Temperate Forest was barely a forest at all since the disaster, with no trees around but the small treeballs. Under these conditions in that particular forest the tumortree evolved to replace its ancestor without any competition with other plants and rose up to 4 meters making that biome a forest again. Tumortrees have almost completely lost their usual spore reproduction and spread and started to reproduce mainly by extensions that grow from its sides into new (yet most of the times still connected) organisms. The tumortree became much harder and barkier with thicker balls and a hard dead shell under them that grows from the dead balls that melt together. Its extension made the Flisch Temperate Forest a truly tangled biome where one can hardly find a place to step without a tumortree extension under its foot. In fact the main way the tumortrees do disconnect from each other is by the stamping of animals on their extensions.