Cresponea plurilocularis
≡Lecidea premnea var. plurilocularis Nyl., Annls Sci. nat. Bot. sér. 4, 15: 49 (1861).
Description : Thallus whitish to greenish, continuous, cracked or rarely areolate, often delimited by a thin, dark-brown hypothalline line, up to 450 μm thick in section. Apothecia scattered, sessile, constricted at base, 0.2–1.8 mm diam., sometimes with a central column of sterile tissue, with a smooth to crenulate margin. Disc plane or subconvex, green-yellowish to ochraecous-yellowish, pruinose when young, epruinose at maturity. Hymenium 80–110 μm tall, I+ reddish. Hypothecium hyaline to pale-brown, 25–50 μm thick, I+ blue or reddish. Paraphysoids to 2 μm diam. in hymenium; apical cell thickened, to 4–5 μm, with a distinct, ±dark-brown cap. Asci 65–100 × 18–22 μm. Ascospores fusiform, 30–43(–45) × 6–8(–9) μm, 7–10(–11)-septate, cell walls ±thickened at septa, lumina roundish to sublentiform. Pycnidia immersed or subimmersed. Conidia 4–6 × 1–1.2 μm.
N: Gisborne (Lake Waikaremoana). S: Southland (Pourakino Valley). On bark of beech trees in forest (Nothofagus fusca, N. menziesii), at bases of tree trunks, especially in dry overhangs where it occurs with Chrysothrix candelaris and species of Lecanactis and Caliciales. Known also in eastern Australia from Tasmania, New South Wales to Queensland, Lord Howe I., New Caledonia, Borneo, Java, and Sumatra (Egea & Torrente 1993b; McCarthy 2003c, 2006; Kantvilas 2004j, 2006).
Indo-Malaysian
Illustrations : Egea & Torrente (1993b: 306, fig. 2D); Lumbsch et al. (2001a: 42); Kantvilas (2006: 35, fig.1; 36, fig. 2 – as Lecidea inalbescens).
Cresponea plurilocularis is characterised by: the corticolous habit; the whitish to greenish continuous to areolate thallus; scattered, sessile apothecia with a plane to subconvex, yellow-green to ochraceous disc, pruinose at first becoming epruinose at maturity; a colourless to pale-brown hypothecium; hamathecium of paraphysoids; and fusiform, 7–10(–11)-septate ascospores, 30–43(–45) × 6–8(–9) μm, cell walls ±thickened at septa, lumina roundish to sublentiform.
