Flora of New Zealand Series

≡Schismatomma platygraphellum (Nyl.) Zahlbr., Cat. lich. univ. 2 (4): 563 (1923).

=Arthonia (Lecanactis) verruculosa C.Knight, Trans. N. Z. Inst. 15: 353 (1883).

≡Platygrapha verruculosa (C.Knight) Müll.Arg., Bull. Soc. Roy. Bot. Belg. 31 (2): 35 (1892).

Lectotype: New Zealand. Otago, Green Island Bush, on "Totara" bark, 4.xi.1861, W. Lauder Lindsay – E [fide Galloway (1985a: 13)].

Arthonia verruculosa. Type: New Zealand. Sine loco [proably Wellington], Charles Knight – WELT – not seen.

Description : Flora (1985: 13).

N: S: St: Widely distributed on bark of Podocarpus totara, also on bark of Metrosideros excelsa, Nothofagus menziesii where it is frequently parasitised by * Chaenothecopsis brevipes (Tibell 1987: 121).

Endemic

Illustrations : Lindsay (1866c: pl. XXIX, fig. 21); Knight (1883: pl. XXXV, fig. 6 – as Arthonia verruculosa).

Arthonia platygraphella is characterised by: the corticolous habit; the thin, continuous, minutely cracked, wrinkled-plicate grey-white thallus; scattered, solitary to 2–3-confluent black apothecia that are white-pruinose; and ellipsoidal, 3–4-septate ascospores, 13–16.5 × 4.5–5 μm.