Knudsen, K. 2011: Acarospora nashii, a lichenicolous lichen from western North America. - Bibliotheca Lichenologica106: 169-172. [RLL List # 223 / Rec.# 32896] Abstract: The type of Acarospora succedens, believed lost, was rediscovered at the Farlow Herbarium. A taxon collected by Thomas Nash, previously treated as Acarospora succedens by the author, is recognized as new to science and given the name A. nashii. Acarospora interspersa H. Magn. is placed in synonymy with A. succedens.