Paraporpidia glauca
≡Lecidea glauca Taylor, Lond. J. Bot. 6: 149 (1847).
Description : Thallus verrucose or areolate, areolae 0.5–1(–1.5) mm diam., creamish or pale-brownish, 0.1 mm thick, surface plane, roughened, spreading to 5 cm diam. Apothecia round to irregular, scattered to crowded, sessile, not constricted at base, 0.8–1.4(–2) mm diam. Disc convex, black, matt, grey-pruinose; margins persistent, matt, black or grey. Exciple 60–150 μm thick, outer, ectal zone dirty brownish, 12–20 μm thick, inner zone colourless to pale grey-brown. Hypothecium dark-brown, 100–200 μm thick. Hymenium 60–80(–100) μm tall, colourless I± blue; epithecium brown, diffuse; paraphyses branched and anastomosing, 1.5–2 μm diam., apices 2.5–3.5 μm diam. Asci 55–70 × 10–12 μm, tholus 5–10 μm thick, amyloid tube 3–3.5 μm diam. Ascospores ellipsoidal, 10–16 × 4.5–7.5 μm. Pycnidia immersed. Conidia filiform (18–)22–33(–38) × 0.5–1 μm.
Chemistry : Cortex K−,C−, Pd−; medulla K−, C−, Pd−; containing confluentic acid (major), 2'- O -methylperlatolic acid, 2'- O -methylmicrophyllinic acid (minor).
N: S:. Known also from Australia (Rambold 1989; McCarthy 2003c, 2006).
Australasian
Paraporpidia glauca is characterised by: the scattered, lecideine apothecial discs; the inner zone of the exciple pale-brownish or colourless; ascospores 10–16 × 4.5–7 μm; and confluentic acid in the medulla. It is found in arid habitats.
