  Advances in time resolved spectroscopy have provided new insight into the
energy transmission in natural photosynthetic complexes. Novel theoretical
tools and models are being developed in order to explain the experimental
results. We provide a model calculation for the two-dimensional electronic
spectra of Cholorobaculum tepidum which correctly describes the main features
and transfer time scales found in recent experiments. From our calculation one
can infer the coupling of the antenna chlorosome with the environment and the
coupling between the chlorosome and the Fenna-Matthews-Olson complex. We show
that environment assisted transport between the subunits is the required
mechanism to reproduce the experimental two-dimensional electronic spectra.
