Caloplaca circumlutosa Zahlbr.
Lectotype: New Zealand. Otago. Dunedin, St Clair. On coastal rock. J.S. Thomson ZA 36, CHR 373792!
Thallus crustose, in irregular patches 1-3(-5) cm diam., closely attached, 0.1 mm thick, often eroded and very thin, roughened, continuous to minutely verrucose-areolate, orange-yellow, paler in shaded situations, K+ purple, margins ± entire not crenulate or plicate. Apothecia sessile, crowded, often covering whole thallus, rounded or distorted by mutual pressure, disc concave to plane 0.1-0.4 mm diam., orange, margins persistent, thin, entire, prominent in young fruits and ± obscuring disc, slightly paler than disc, concolorous with thallus. Paraphyses submoniliform at apices. Ascospores biseriate, ellipsoid to oblong-ellipsoid, apices rounded to slightly pointed, straight, 2-locular, 14-17 × 7-8.3 µm, septum ¼ to ⅓ of length of spore.
N: Wellington (Titahi Bay). S: Otago (Dunedin, Akatore Mouth, Nugget Point), Southland (Pahia Point). St: (Port William). On coastal rocks at high tide mark or above.
?Australasian
