Well, saying this is as huge as the discovery of the neutron for the atomic model is stretching it, IMO. Atoms make up everything, understanding how atomic nuclei are made up has paved the road for huge breakthroughs in not just nuclear physics but also in medicine, energy production, materials physics, etc. Lichen, on the other hand, are, well lichen. If we'd been throwing money on lichen research like we have on nuclear physics, we would have known this a century ago.