Ramathallus is a genus of sessile lobate alga that represents a probable stem-Rhodophyte from the Upper Statherian, 1600 Million years ago.

[1] The holotype of Ramathallus lobatus shows a cell structure with finger-like protrusions and a coating of non-cellular apatic.

[1] The organism grew by apical growth and possessed pseudoparenchymatous thallus which in turn infer a possible affinity with the Florideophyceae.

Many lobate protrusions radiated from the organisms centre composed out of pseudoparenchymatous tissue interpreted as "Cell fountains" made up of variably-sized cells.

Ramathallus shares a close morphological similarity with the Ediacaran genera made up of pseudoparenchymatous, lobate fossils (Thallophyca, Thallophycoides, Paramecia and Gremiphyca) from the Doushantuo phosphorites of China .