Garrett Co., on block of cement. Skorepa et al. (1979) – on calcareous rock, cement. E.G. Worthley Herbarium - Baltimore Co., St. Thomas Church Cemetery, on rock wall. Platismatia tuckermanii (Oakes) Culb. & C. Culb. [Parmeliaceae] Skorepa et al. (1977) – Garrett Co., on sandstone boulder. Skorepa et al. (1979) – on bark, acidic rock, wood Polysporina simplex (Davies) Vezda [Acarosporaceae] Syn.: Sarcogyne simplex (Davies) Nyl. Skorepa et al. (1979) – on acidic rock. E.G. Worthley Herbarium - Howard Co., on rock outcrop. Porina cestrensis (Tuck. ex Michener) Müll. Arg. [Trichotheliaceae] Skorepa et al. (1979) – on bark. Porina heterospora (Fink ex J. Hedrick) R.C. Harris [Trichotheliaceae] Lendemer & Knapp (2007) - (5. Hickory Pt.), (6. Pocomoke) Porpidia albocaerulescens (Wulfen) Hertel & Knoph [Porpidiaceae] Syn.: Lecanora albocaerulescens (Wulf.) Ach. Skorepa et al. (1977) – Lichens of Soldiers Delight. Skorepa et al. (1979) – on acidic rock. E.G. Worthley Herbarium - Baltimore Co., near small bridge, on Wissahickon schist; Frederick Co.; Garrett Co., on rocks along Big Run. E.C. Uebel Herbarium – Baltimore Co., Liberty Reservoir, on sandstone boulder. Porpidia crustulata? (Ach.) Hertel & Knoph [Porpidiaceae] E.C. Uebel Herbarium – Lichens of Soldiers Delight. Porpidia macrocarpa (DC.) Hertel & A. J. Schwab [Porpidiaceae] Syn.: Lecidea macrocarpa (DC.) Steud. Skorepa et al. (1977) – Garrett Co., on sandstone. Skorepa et al. (1979) – on acidic rock. Protoblastenia rupestris (Scop.) J. Steiner [Psoraceae] Skorepa et al. (1979) – on calcareous rock, cement. Pseudevernia consocians (Vainio) Hale & Culb. [Parmeliaceae] Syn.: Parmelia furfuracea (L.) Ach. Skorepa et al. (1977) – Garrett Co., on upper branches of Hemlock. Skorepa et al. (1979) – on bark. E.G. Worthley Herbarium - Baltimore Co., Owings Mills. Pseudosagedia cestrensis (Tuck. ex E. Michener) R.C. Harris [Porinaceae] Lendemer & Knapp (2007) - (2. Idylwild) Pseudosagedia raphidosperma (Müll. Arg.) R.C. Harris [Porinaceae] Lendemer & Knapp (2007) - (4. Sharptown) Psora decipiens (Hedwig) Hoffm. [Psoraceae] Syn.: Lecidea decipiens (Hedwig) Ach. Skorepa et al. (1979) – on soil. Psora russellii (Tuck.) A. Schneider [Psoraceae] Syn.: Lecidea russellii Tuck. Skorepa et al. (1977) – Frederick Co., on conglomerate boulders. Skorepa et al. (1979) – on calcareous rock. Psorotichia schaereri (A. Massal.) Arnold [Lichinaceae] Skorepa et al. (1979) – on cement. Psorula rufonigra (Tuck.) Gotth. Schneider [Psoraceae] Syn.: Lecidea rufonigra (Tuck.) Nyl. Skorepa et al. (1977) – Lichens of Soldiers Delight. Skorepa et al. (1979) – on acidic rock. Punctelia appalachensis (Culb.) Krog [Parmeliaceae] Syn.: