Twenty-five North American lichens are issued in this exsiccat series, numbers 151-175. In this fascicle, collections were made from nine states, including: Alaska (1), Arizona (3), California (2), Colorado (6), Idaho (1), Montana (4), Nevada (2), New Mexico (4), and Utah (2). Here, Thamnolia subuliformis (Ehrh.) W. L. Culb. (No. 173) is reported as a new species record for Utah.