بولدرفيلد بولدرفيلد الحمضية غير الوعائية عالية الارتفاع في وسط الآبالاش - 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