Caloplaca acheila Zahlbr.
C. acheila var. rubentior Zahlbr., Denkschr. Akad. Wiss. Wien math.-naturwiss. Kl. 104: 368 (1941).
C. acarocarpa Zahlbr., Denkschr. Akad. Wiss. Wien math.-naturwiss. Kl. 104: 368 (1941).
Lectotype: New Zealand. Rangitoto Island, on coastal rock. H.H. Allan Z96, CHR 373787!
C. acheila var. rubentior. Lectotype: New Zealand. North Auckland, Hen I., just above High Tide L.M. Cranwell 17.11.1933, ZA 261, CHR 374040!
C. acarocarpa. Lectotype: New Zealand. Rangitoto I., on coastal rock. H.H. Allan 52 CHR 373658!
Thallus crustose, minute, dispersed, of oblong or sublinear granules, to 1 mm long and 0.2 mm wide, suberect or convex or unevenly swollen, effuse or lacking, whitish, K-, saxicolous. Apothecia sessile, crowded to dispersed, 0.05-0.3 mm diam., disc matt, orange, epruinose, concave, rarely plane, margins entire, persistent, whitish to concolorous with disc. Ascospores biseriate, ellipsoid, apices rounded, straight, 2-locular, septum c. ⅓ length of spore, (11-)13-17 × 6-8.3 µm.
N: Northland (Hen I. to Rangitoto I.). Known only from northern coastal rocks. Common on volcanic rocks, the many interstices offering suitable niches for the widely scattered granular thallus.
Endemic
This species is not well separated from C. allanii.
