Does anyone know of any lichen that will grow in a high-lime environment? Building with hemp-crete is way cool, but would be even cooler if some surfaces could be coloured using lichen. Nova Scotia has a generally humid environment so lichen grows well, especially along the coast where one sees the brightest orange and yellow lichens on rocks and old concrete. Hmmm, old concrete-that should contain significant lime, perhaps the varieties that grow on concrete would grow on a lime surface??