Central Appalachian High-Elevation Acidic Nonvascular Boulderfield – CEGL004389
The small "rock tripe" Umbilicaria muehlenbergii densely covers the sandstone boulders on Sounding Knob in Highland County. A few small yellow birch (Betula alleghaniensis) saplings have managed to become established in the deep spaces between boulders. Highland State Wildlife Management Area. © DCR-DNH, Gary P. Fleming