Arthonia sp. A
General description:
Description:
Thallus: edolithic
Ascocarps: irregular, black
Ascospores: becoming dark brown (bluish-green in KOH; red in HNO3), 3-septate, constricted at median septum, 28-31 x 12-13 µm
Distribution: East Falkland: Stanley, Mt Kent. One collection (Imshaug 40445) on rock with Pertusaria macloviana.