ADDITIONS TO THE LICHEN FLORA OF ARIZONA IV

One hundred-twelve species of lichens are reported for the first time from Arizona. The new combination Lecanora muralis var. brunneola (Mer eschk.) Ryan & Nash is made, and the variety is reported as new to Nor th America. The following 19 taxa are also reported for the first time from North America, north of Mexico: Absconditella lignicola, Calopla ca brouardii, Hypotrachyna dactylifera, Lecanora cavicola, L. plumosa, L. swartzii, Mycocalicium victoriae, Pertusaria moreliensis, Placidiu m pilosellum, Pyxine meissneriana, Rhizocarpon arctogenum, Umbilicaria subglabra, Verrucaria obductilis, V. trabicola, Xanthoparmelia austra lasica, X. consociata, X. isidiosa, X. neocongensis, and X. tegeta.