Arthopyrenia gemellipara (C.Knight) Müll.Arg.
Verrucaria epidermidis var. gemellipara Knight, Trans. Linn. Soc. Lond. 23: 99 (1860).
V. circumpressa Nyl., Lich. N.Z.: 133 (1888).
Lectotype: New Zealand. Sine loco (?Auckland). Charles Knight, BM!
Verrucaria circumpressa. Type: New Zealand. Sine loco (prob. Wellington). Charles Knight, H-NYL - not seen.
Thallus yellowish-brown, very thin, shining or matt, smooth to ± undulate, limited by a prominent dark, irregular line, in mosaic-like patches 20-50 mm diam., corticolous. Perithecia black, frequent, scattered, 0.1-1 mm diam., rounded to ± oval or irregular, raised, ± hemispherical, often clustered, shining, with a small depressed apical pore, eroding leaving a small brown-black pit. Paraphyses distinct. Ascospores 1-septate, constricted at septum, 15-18 × 6-7 µm.
N: Known only from the type collection.
Endemic
The BM material (8 collections) is from smooth bark and is characterised by the pale, yellow-brown thallus sprinkled with numerous black fruits.
