Ascus with 8 spores. Spores with the following dimensions: (56.9) 62.2 - 85.8 (95.8) x (30.5) 31.5 - 38.7 (42.1) µm Q = (1.5) 1.8 - 2.4 (2.6) ; N = 40 Me = 74.3 x 35.7 µm ; Qe = 2.1 Using A Preliminary World-wide Key to the Lichen Genus Pertusaria - Group 20, Pertusaria hymenea is the only with spores of the above dimensions. See MO69283, and MO68624 for other similar specimens.