Tylothallia pahiensis
≡Lecidea pahiensis Zahlbr., Denkschr. Akad. Wiss. Wien math.-naturwiss. Kl. 104: 303 (1941).
≡"Catillaria pahiensis" (Zahlbr.) Hertel, Herzogia 2: 38 (1970).
Holotype: New Zealand. South I., Southland, Foveaux Strait, Pahia Point (W. of Riverton), on granitic coastal rocks, viii.1935, J.S. Thomson T2242 [A1] – W. Isotypes – BM, CHR 347056a, 347056b, OTA 29230. See Hertel (1970c: 38–39; 1983: 446).
Descriptions : Flora (1985: 235–236 – as Lecidea pahiensis). See also Hertel (1970c: 38–39) and Rambold (1989: 156).
Chemistry : Cortex K+ yellowish, Pd± yellow, C−; medulla K−, Pd−. Two chemodemes present: (1) containing atranorin and lecideoidin; (2) containing atranorin and gangaleoidin (Rambold 1989: 156).
N: Northland (Great Barrier I., Tawharanui Peninsula E of Warkworth), South Auckland (Slipper I.) to Wellington. S: Nelson to Otago (Kaka Point), Southland (Bluff, Howell's Point, Pahia Point). St: On coastal rocks, commonly with Lecanora subcoarctata, Rinodina thiomela and Tephromela atra. Also in South Australia, Victoria, New South Wales and Tasmania (Hertel 1989b; Rambold 1989; Filson 1996; Nordin et al. 1999; Lumbsch et al. 2001; McCarthy 2003c, 2006).
Australasian
Exsiccati : Hertel (1984c: No. 140; 1988a: No. 200).
Illustrations : Malcolm & Malcolm (2000: 118); Lumbsch et al. (2001: 15).
Tylothallia pahiensis is characterised by: the saxicolous habit (coastal rocks); a chalky whitish, roughened, irregularly areolate thallus, scattered, sessile, solitary to 2–4-confluent, coal-black apothecia with epruinose discs and a thin, black, raised, flexuous black margin, a colourless to pale-brownish hypothecium, simple to 1-septate spores, 8–10.5(–12) × 3–5 μm, and the production of either gangaleoidin or lecideoidin as well as atranorin.
