Stellar Lichen Tree 

Lichen Trees (clade-Arborlecanoromycetes) were already massive towers of multiple organisms working together.

During the late Ice Age, one clade has incorporated another partner into this already complex relationship.

Steller Lichen Trees like the Brazen Stellar Lichen Tree have grown even bigger, reaching a staggering 120 feet tall dwarfing all other flora in the Slime Forest. They do this thanks to the leaves along their branches.

These leaves aren’t theirs and instead belong to a parasitic plant called the Stellar Berries belonging to the genus Rubus, originally these parasitic plants rooted into the cuticles of Lichen Trees to siphon some of the vast amounts of energy produced by the cyanobacteria and algae within the tree similar to mistletoe.

This couldn't be done in great numbers since the slither sucker within the tree acts to remove parasites from their lichen tree. At some in the last 5 million years, the Stellar Berry through the backwash of their roots let them share nutrients with the Lichen Tree. Sharing nutrients meant the slime was less inclined to kill them quickly resulting in an evolutionary pressure to share more. 

It's the symbiosis with the Steller Berries that had allowed the trees to grow so big, with their integration into the Lichen Trees meaning that they also get the benefits of the Slime letting them grow far more numerous than other parasitic plants covering the Steller Tree like a full set of proper leaves.

The other part of the Stellar Tree the Dripping Dew Vine is also changed from their ancestor. Dripping Dew Vines coordinate their pollination with the Steller Berries at the beginning of summer.

The spore pods are smaller than those of other Lichen Trees, while some still disperse on the wind, others will land on the Steller Berries to be carried with the plant’s seeds through the stomachs of Songbird Blish and eventually other herbivores when the berries fall to the forest floor. This increases the Steller Tree’s reach through multiple methods of spreading and increases chances of survival not dependent on the winds and weather.