After having enjoyed the tulips of Omalós, we drove to the west, one of the only two directions to move away from Omalós (the other direction is to the south). We stopped near a gully on a mountain slope. Such gullies are visible from a large distance, because the deciduous Chestnut tree, Castanea sativa, grows only in the gullies, and the color of their tender budding foliage stands out in the landscape. When I looked around in one such gully, I found that the trunks of the Chesnut trees are richly adorned with lichens.