Flora of New Zealand Series

≡Lecanora subundulata Stirt., Proc. phil. Soc. Glasgow10: 295 (1877).

≡Bacidia subundulata (Stirt.) R.Sant., Symb. Bot. Upsal. 12 (1): 453 (1952).

Lectotype (selected here): New Zealand. Wellington ?? John Buchanan 52/74 – WELT.

Description : Flora (1985: 34 – as Bacidia subundulata).

N: South Auckland (Hunua Ra.), Wellington (Colonial Knob, Kaitoke). S: Nelson (Supplejack Trail), Canterbury (Peel Forest). On leaves of Freycinetia banskii, Podocarpus totara and ferns. Known also from Australia (McCarthy 2003c, 2006).

Australasian

Illustrations : Malcolm & Galloway (1997: 96, 157); Australasian Lichenology 45 (1999: back cover); Malcolm & Malcolm (2000: 134; 2001: 38); Lumbsch et al. (2001: 48).

Exsiccati : Vězda (1993: No. 91; 1997d: No. 293).

Byssoloma subundulatum is characterised by: the foliicolous habit; the greenish grey, subfarinose to subsorediate thallus, often best developed at margins of leaves with a thin, whitish, photobiont-free mycelium developed on the lower surface and connected to the photobiont-containing thallus of the upper leaf surface; apothecia abundantly developed on the mycelium of the lower leaf surface or at the margins of the leaves; the chocolate-brown epruinose disc; conspicuously white, downy margins; and 3–5-septate ascospores, 12–18 × 3–4 μm. Santesson (1952: 454) did not locate any original material of Stirton's Lecanora subundulata (none either in E or BM) and instead selected a neotype from material collected by H.H. Allan from leaves of Polystichum hispidum on Colonial Knob near Wellington. A recent discovery of original Buchanan material in the herbarium of Otago University (OTA), duplicates of which were sent to James Stirton, allows the Buchanan material (now in WELT) to serve as lectotype (see above).