The species morphologically, anatomically, and chemically resembles the common dark rock lichen, R. polycarpum, and may have been overlooked due to confusion with that species. It differs by having slightly muriform, not 1-septate, ascospores. Gyrophoric acid is not known from Norwegian material of the dark rock lichen. While the dark rock lichen occurs from sea level to high up in the mountains, R. distinctum seems to be limited to lowland areas.[1]
Notice: The data in the table above is semi-automatically extracted from the description. Please be sure to check the original documents for accurate information.