Porina exacta
Holotype: New Zealand. Nelson, Hira, Conifer Track, 300 m from junction with Waterfalls Track, 41°16.0's, 173°24.4'E, on siliceous rock in lowland forest dominated by Nothofagus and Dicksonia, 410 m 3.vii.1994, W. Malcolm 2100 – CHR.
Description : Thallus epiphloeodal, continuous to rimose, pale brownish green, matt to slightly glossy, smooth to minutely rugulose, 40–80 µm thick, ecorticate; prothallus not apparent. Photobiont Trentepohlia; cells 6–12 × 6–10 µm. Perithecia superficial, hemispherical to subglobose, 0.3–0.5 mm diam., reddish brown; apex rounded; ostiole usually inconspicuous. Involucrellum contiguous with the exciple, these diverging near the base, to 60 µm thick, containing algae, K−. Exciple c. 25–30 µm thick, pale orange-brown. Centrum 0.2–0.33 mm wide. Asci elongate-cylindrical, 113–160 × 14–18 µm. Ascospores elongate-cylindrical, 15-septate, 58–97 × 4–6 µm; perispore not apparent. Pycnidia not seen.
S: Nelson. Known only from the type locality where it occurs on siliceous rocks in shady, lowland forest. Known also from a single site in Tasmania (Malcolm et al. 1995c; McCarthy 2001f: 127; 2003c; 2003d).
Australasian
Illustration : Malcolm et al. (1995c: 353, fig. 1).
Porina exacta is characterised by: the foliicolous habit; red-brown perithecia; the orange-brown exciple; and 15-septate ascospores, 58–97 × 4–6 µm.
