This rare moss grows in mats less than 1/4 inch thick on an old concrete foundation in Fontenelle Forest. During normal, dry conditions this dark-colored moss shrivels up as shown in image (C). But as soon as it rains, or when sprayed with water, this moss almost instantly straightens its tiny pointed leaves to form an attractively patterned moss cushion (A). In early spring, when the conditions are right, tiny greenish capsules are formed (D), each with an orange lid (operculum). The operculum later flips open revealing a fringe of bright red teeth (peristome). They spread to release the microscopic spore mass (E). In order so show the microscopic features of such a capsule, the last two images were not taken in the field – an exception to our rules – but with a special macro-lens setup at home.