Cetrariella delisei
≡Cetraria islandica δ delisei Bory ex Schaer., Enum. crit. lich. europ.: 114 (1850).
Description : Flora (1985: 82 – as Cetraria delisei).
Chemistry : Medulla K−, C+ red, KC+ red, Pd−; containing gyrophoric and hiascic acids.
S: Otago (Old Man Ra., Rock and Pillar Ra.). On ground or amongst cushion vegetation on exposed Central Otago mountain summits, usually in the most exposed sites such as wind-scoured depressions at the bases of summit tors. An arctic-alpine, circumpolar species, known also from Great Britain, Europe, Scandinavia, the Arctic, Greenland, North America, southern South America and the Falkland Is (Kärnefelt 1979; Purvis et al. 1992; Santesson 1993; Goward et al. 1994b; Hansen 1995; Galloway & Quilhot 1999; Fryday 2001b; Santesson et al. 2004).
Bipolar
Illustrations : Kärnefelt (1979: 68, fig. 35); Moberg & Holmåsen (1982: 74); Thomson (1984: 77); Kärnefelt et al. (1993: 398, figs 8,11; 401, fig. 15); Goward et al. (1994b: 38, fig. 16A – as Cetraria delisei); Krog et al. (1994: 129 – as Cetraria delisei); Hansen (1995: 19); Brodo et al. (2001: 219, pl. 193); Fryday (2001b: 350, fig. 5); Pope (2005: 6).
Cetrariella delisei is readily distinguished from Cetraria islandica ssp. antarctica, by its yellow-brown to greenish or grey-brown colour; the laminal pseudocyphellae; and the C+ red reaction of the medulla. For differences between closely related taxa see Thell et al. (2002: 284, tab. 1).
