The following taxa are reported for the first time from Pennsylvania: Absconditella lignicola, Candelariella xanthostigma, Catillaria nigroclavata, Fuscidea arcuatula, Halecania pepegospora, Hypocenomyce friesii, Lichenoconium erodens, Microcalicium ahlneri, Myriospora heppii, Placynthium nigrum, Protoblastenia incrustans, Staurothele fissa, Strigula jamesii, Thelidium papulare, and Tremella candelariellae. The following taxa are reported for the first time from New Jersey: Arthonia epiphyscia, Fuscidea arcuatula, and Lecanora xylophila. The distribution of Botryolepraria lesdainii in eastern North America is discussed and mapped. The first modern collections of Buellia maculata, Dirinaria frostii, and Thelocarpon laureri from Pennsylvania are also reported. An additional population of the rare species Physcia pseudospeciosa is reported from Pennsylvania.