Flora of New Zealand Series

≡Lichen radiosus Hoffm., Enumer. Lich.: tab. IV (1784).

≡Aspicilia radiosa (Hoffm.) Poelt & Leuckert in S. Hermann, C. Leuckert & J. Poelt, Willdenowia 7 (1): 25 (1973).

=Lecanora (Placodium) allanii Zahlbr., Denkschr. Akad. Wiss. Wien math.-naturwiss Kl. 104: 346 (1941).

Lecanora allanii. Lectotype: New Zealand. Wellington, Manawatu Gorge, on rocks submerged in flood periods, H.H. Allan W 59 – CHR 345882 [fide Galloway (1985a: 212)]. Isolectotype – CHR 347070 [H.H. Allan ZA 414].

Description : Flora (1985: 211–212 – as Lecanora (Placodium) allanii).

Chemistry : Variable, TLC−, or with norstictic acid.

N: Wellington (Manawatu Gorge, Ohau River). S: Nelson (Kaituna Gorge, Pelorus Bridge, Buller River), Canterbury (Porter's Pass), Otago (Canyon Creek, Ahuriri River, Kawarau Gorge, Cromwell Gorge, Black Head), Southland (Gertrude Valley, Hollyford River, upper Mataura River, Waikaia River). On riverine rocks (often partly or periodically immersed), schist outcrops near rivers or streams, also on coastal rocks and in alpine greywacke talus at 1200 m. Associating with Candelariella vitellina, Physcia caesia, Placopsis ampliata, P. elixii, P. illita, P. perrugosa. Still rather poorly known in New Zealand. A widespread species in the Northern Hemisphere (Hermann et al. 1973; Nimis 1993; Santesson 1993; Wirth 1995a, 1995b; Scholz 2000), known also from North America (Esslinger & Egan 1995) and Australia (Filson 1996; McCarthy 2003c, 2006; Nimis & Martellos 2003; Ryan 2004a; Santesson et al. 2004).

Cosmopolitan

Illustrations : Wirth (1987: 55 – as Aspicilia radiosa; 1995a: 564); Foucard (1990: pl. 47 – as Aspicilia radiosa); Lumbsch et al. (2001: 24); Sérusiaux et al. (2004: 104).

Lobothallia radiosa is characterised by: the saxicolous habit (periodically or partially inundated rocks); a greyish, radiating, closely attached, rosette-shaped thallus; radiating plicate–lobate, marginal thalline lobes; ±central, clustered, immersed aspicilioid apothecia; paraphyses without moniliform apices; and subglobose to ellipsoidal ascospores, 10–12(–15) × 7–9 μm.