It is patchily or discontinuously distributed, with the patches separated by faulting. The understorey tends to be sparse to patchily dense. It is widely but patchily distributed across Britain. At times the spores are densely clustered or patchily distributed, depending on the host species. This armadillo is seldom sighted, and may be rare and/or patchily distributed. This species is patchily distributed in southern India and Sri Lanka. It is a common species although very patchily distributed. Its population is small, fluctuating and patchily distributed. The Taita falcon is patchily distributed from eastern and southern Africa. Grylloblattidae are patchily distributed on glaciers in North America, China, Siberia, Korea and Japan. It has a large geographic range, though its populations are patchily distributed. Although patchily distributed, it is common in many areas, with no population considered vulnerable. It is found in southern Asia, where it is patchily distributed and declining in numbers. Now, it remains patchily distributed within historical limits. One of the widest-ranging deepwater sharks, the Portuguese dogfish is patchily distributed around the world.