A few Poralp Tree fragments were swept into warmer waters to the north. When they settled in, the concentration of light was more intense than in seas closer to the poles. The descendants of these stowaway poralps immediately exploited this abundance and split off from their ancestry, becoming the Greater Poralp Trees - the largest organisms the seas have seen so far.
Like their ancestry, Greater Poralp Trees grow branching tissues which gradually ascend above the seabed. However, the further the branches grow from the base stem, the flatter in shape they become, forming thallus-like structures akin to earthly kelp; this ensures a greater surface area in which light can be absorbed. The cells consisting of the thalli also house greater concentrations of plastids, while cells closer to the base are more dedicated towards structural support and nutrient storage. The cells within the substrate have become a holdfast, providing an ample foundation for such a large alga.
Although new Greater Poralp Trees can be grown from severed fragments of a parent organism, the species pioneered a new reproductive innovation - spores! Spores are regularly produced underneath a thallus during an abundance of nutrients. Once sufficiently developed, the spores are promptly released into the water column, able to spread across the seas much farther than their ancestors could and settle on a wide variety of warm coastlines, firmly ensuring the species’s current prevalence and abundance.