The following taxa are newly reported for Pennsylvania: Acarospora dispersa, A. tuckerae, Anisomeridium biforme, Arthonia quintaria, Aspicilia caesiocinerea, Bacidia beckhausii, B. helicospora, B. rubella, Biatora pontica, Buellia badia, Canoparmelia texana, Carbonea latypizodes, Cladonia gracilis subsp. turbinata, Collema bachmanianum, Distopyrenis americana, Illosporium carneum, Lecidea plebeja, Lecidea tessellata, Lecidella stigmatea, Leptorhaphis epidermidis, Melanelia stygia, Micarea micrococca, Myelochroa metarevoluta, Nephroma parile, Parmeliella triptophylla, Parmotrema perforatum, P. subisidiosum, Pertusaria consocians, P. texana, Phaeospora rimosicola, Physcia halei, Placidiopsis minor, Pseudosagedia raphidosperma, Ramalina pollinaria, Rinodina excrescens, R. papillata, Sclerococcum simplex, Tremella cladoniae, and Usnea amblyoclada. A modern report of Bacidia diffracta is documented. The geographic distribution and present day status of Acarospora tuckerae are discussed.

Racomitrium aciculare is reported new for Missouri. Hypnum lindbergii var. americanum and Hygrohypnum eugyrium are similar in having weakly falcate, blunt leaves with weak costae, entire margins, inflated alar cells, and distinct, reddishorange cells interior to the alar cells. Hypnum lindbergii var. americanum differs gametophytically from Hygrohypnum eugyrium in having a distinct stem hyalodermis.