Rinodina immersa
≡Rinodina bischoffii var. immersa Körb., Parerga Lich.: 75 (1859).
Description : Thallus endolithic (on calcareous substrata), rarely thinly epilithic and then whitish to pale-grey, finely granular, prothallus absent. Apothecia biatorine, with groups of photobiont cells in margin, to lecideine with a brown amphithecium, immersed in substratum, scattered, 0.3–0.6 mm diam.; disc brown to black sometimes white-pruinose, plane to convex. Parathecium hyaline. Epithecium dark-brown. Hymenium 75–95 μm tall, not inspersed with oil droplets. Paraphyses 1.5–2.5 μm thick, apices capitate, terminal 1–2 cells 4.5–5 μm diam. Hypothecium 45–130 μm thick, sometimes inspersed with oil droplets, K−. Ascospores Bischoffii -type, spore ontogeny type A, 13–18 × 8–12 μm, wall finely warted.
Chemistry : TLC−, all reactions negative.
S: Marlborough (Kaikoura), Canterbury (Nape Nape, Castle Hill, Cave Stream, Weka Pass, Mt Palm, Coal Creek, Rangitata Valley). On limestone. Known also from Great Britain, Europe, Scandinavia, North America, and Australia (Coppins 2002b; Mayrhofer & Moberg 2002b; Nimis & Martellos 2003; Kaschik 2006).
Cosmopolitan
Illustrations : Nordic Lichen Flora2 (2002: 104); Kaschik (2006: 60, fig. 27).
Rinodina immersa is characterised by: the immersed apothecia; and a restriction to calcareous substrata.
