et al. (1979) – on bark, acidic rock. Biechele (2002) – lower eastern shore of Maryland. E.G. Worthley Herbarium - Calvert Co.; Wicomico Co.; Carroll Co., Falls Realty Company, on cement steps. E.C. Uebel Herbarium – Prince Georges Co., on dead limb; Carroll Co., Liberty Reservoir, on bark. Lendemer & Knapp (2007) - (2. Idylwild) Physcia phaea (Tuck.) J.W. Thomson [Physciaceae] Skorepa et al. (1977) – Baltimore Co., (collected by Plitt 1909) Skorepa et al. (1979) – on acidic rock. Physcia pseudospeciosa J.W. Thomson [Physciaceae] Skorepa et al. (1977) – Baltimore Co., on acid rocks. Skorepa et al. (1979) – on acidic rock. E.G. Worthley Herbarium - Baltimore Co., near Gunpowder River, on vertical acidic rocks. Physcia pumilior R.C. Harris [Physciaceae] Lendemer & Knapp (2007) - (2. Idylwild) Physcia stellaris (L.) Nyl. [Physciaceae] Skorepa et al. (1977) – Baltimore Co., on oak. Skorepa et al. (1979) – on bark. Biechele (2002) – lower eastern shore of Maryland. E.C. Uebel Herbarium – Baltimore Co., on bark of Norway Maple; Prince George's Co., on bark. Physcia subtilis Degel. [Physciaceae] Skorepa et al. (1977) – Montgomery Co., on rock ledges. Skorepa et al. (1979) – on acidic rock. E.G. Worthley Herbarium - Frederick Co., Cunningham Falls. Physciella chloantha (Ach.) Essl. [Physciaceae] Syn.: Physcia luganensis Mereschk. Skorepa et al. (1977) – Queen Anne's Co., on cement bridge. Skorepa et al. (1979) – on bark, cement. E.C. Uebel Herbarium – Prince George's Co., along bike path, on concrete; on tree branch. Physconia detersa (Nyl.) Poelt [Physciaceae] Skorepa et al. (1979) – on bark, calcareous rock, cement. E.G. Worthley Herbarium - Lichens of Soldiers Delight; Baltimore Co., Green Spring Valley, on brick wall; on old cement bridge. Placidium arboreum (Schwein. ex Michener) Lendemer [Verrucariaceae] Syn.: Dermatocarpon tuckermanii (Rav.) Zahlbr.; Placidium tuckermanii (Ravenel ex Mont.) Breuss Skorepa et al. (1977) – Allegany Co., base of White Oak. Skorepa et al. (1979) – on bark. E.G. Worthley Herbarium - Allegany Co., Green Ridge State Forest, on base of White Oak. Placidium lachneum (Ach.) Breuss [Verrucariaceae] E.G. Worthley Herbarium - Lichens of Soldiers Delight. Placynthiella uliginosa (Schrader) Coppins & P. James [Agyriaceae] Syn.: Lecidea uliginosa (Schrad.) Ach. Skorepa et al. (1977) – Dorchester Co., on oak trunk. Skorepa et al. (1979) – on bark. Biechele (2002) – lower eastern shore of Maryland. Lendemer & Knapp (2007) - (2. Idylwild) Placynthium nigrum (Hudson) Gray [Placynthiaceae] Skorepa et al. (1977) –