New to lichen identification? Then this image will interest you. It’s a close up of an apothecium, a lichen’s sexual reproductive structure. The apothecia are an important aid to lichen identification. Most have a rim; sometimes the rim is the same colour as the thallus, sometimes not; the area inside the rim is the disc; this can be flat, convex or concave, it may have crystals on it or not, and so on. Combined with other anatomical lichen parts it can lead to a secure identification. Read more here…..