Porina kantvilasii
Description : Thallus epilithic, rimose to areolate, pale to dark greenish grey, matt, minutely uneven, 50–100(–140) µm thick, corticate or not; prothallus usually not apparent, occasionally dark-brown. Photobiont Trentepohlia, cells 6–17 × 6–15 µm. Perithecia ⅓ immersed to superficial, hemispherical to subglobose, 0.22–0.65 mm diam., medium to dark orange-brown (in deep shade) to almost black (in full sunlight); apex rounded; ostiole usually inconspicuous. Involucrellum contiguous with the exciple, extending to exciple base level, 40–100 µm thick, enclosing at least some algae, K−. Exciple 15–30 µm thick, hyaline to yellow-brown. Centrum 0.17–0.35 mm wide. Asci elongate-cylindrical, 70–118 × 7–14 µm. Ascospores elongate-fusiform to filiform, 7(–9)-septate, 33–62 × 2–4.5 µm; perispore not apparent. Pycnidia semi-immersed, 0.08–0.14 mm diam., orange-brown to dark-brown. Conidia fusiform to bacillar, 2–4 × 0.8 µm.
S: Southland (Breaksea Sound, Breaksea I.). C: (Rocky Bay I.). On maritime rocks and subalpine rocks (Campbell I.) s.l. to 175 m. Known also from Tasmania, islands in Bass Strait, and from the SW corner of Western Australia (McCarthy 1993b: 65; 2001e: 133; 2003c; 2003d).
Australasian
Illustrations : McCarthy (1993b: 64, fig. 15); Malcolm & Malcolm (2000: 79).
Porina kantvilasii is characterised by: the maritime saxicolous habit; comparatively large, usually orange-brown perithecia; and elongate, mainly 7-septate ascospores, 33–62 × 2–4.5 µm.
