From 2speccers2tools wiki

One species of screengrass would become better suited to consuming radiation almost exclusively, becoming the Screenpolyph as a result. In many ways, the Screenpolyph is similar to their ancestor, with the species being a colonial organism who starts off as a single organism planting itself into the sediment. This first cell will grow several stiff flagella to help anchor themselves in place so they do not get carried away. From there, the single cell will asexually reproduce until it forms a proper colony. The Screenpolyph is distinct from its ancestors in that is now has several branching structures in the colony as a larger surface area means more radiation can be absorbed for energy. The cell that is rooted in the ground will also take in nutrients from the sediment for energy, though it no longer consumers other microbes like many of its relatives. A Screenpolyph colony will breed sexually with others of it's species via emitting spores from the top-most cells on each branch(another advantage of having the structures). If a branch breaks off from the colony and lands somewhere else, it can also grow into a new Screenpolyph.