The distinguishing sign on older spots is the presence of small, black, speck-like fruiting bodies called pycnidia embedded within the tissue. Not all spots will contain pycnidia, but some may contain up to eight or more.
In the context of older spots, a key identifying characteristic is the presence of tiny, dark, spore-bearing dots called pycnidia embedded in the tissue. However, not all spots will exhibit this feature; instead, some may display multiple pycnidia, ranging from one to eight or more.