'Catillaria' dispersa Fryday in ed.
Thallus composed of isolated pale yellowish areoles, 0.71.01.2 mm across, becoming more continuous in cracks, crevices and depressions; with thin, blue-black, fimbriate prothallus. Photobiont chlorococcoid, cells 812(15) µm diam.
Apothecia flat, lecideine, black with a bluish tinge, rarely slightly pruinose, 0.30.5 mm diam., proper margin indistinct, level with disk, occasionally slightly raised, 0.03 mm wide,. Hymenium 3540 µm high, epihymenial zone 510 µm high, blue-black (HCl+ blue, N+ purple-red); paraphyses simple, septate, 11.5 µm wide, widening to 5 µm at the apex, with the upper 510 µm with blue pigment and with a dark blue cap. Hypothecium hyaline, poorly developed, composed of randomly arranged hyphae. Exciple poorly developed, internally hyaline with swollen (to 10 µm), dark blue cortical cells. Asci Lecanora-type, 30 × 1520 µm, clavate; ascospores 1-septate, hyaline, short-ellipsoid, with pointed ends,810 × 45.5 µm.
Conidiomata not seen.
Chemistry: C, K+ yellow, Pd, UV+ yellow; atranorin by TLC. HPLC required
Distribution & Ecology: Falkland Islands: one collection from ridge near coast.
s. str., but does not appear to belong to any other described genus.