Umbilicaria mammulata (Ach.) Tuck. (photograph of a herbarium specimen showing the black velvety lower surface ) Growing on a rock outcrop along the Appalachian Trail on South Mountain, Frederick County, Maryland, USA; collected and identified by Elmer G.Worthley (No.LH-283); specimen is now in the Lichen Herbarium of the New York Botanical Garden. (scale marks = millimeters)
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{{Information |Description='''''Umbilicaria mammulata''''' (Ach.) Tuck. (photograph of a herbarium specimen showing the black velvety lower surface ) Growing on a rock outcrop along the Appalachian Trail on South Mountain, Frederick County, Maryland, USA