Lambiella psephota (Tuck.) Hertel
Beih. Nova Hedwigia 79: 460. 1984.

Basionym: Lecidea psephota Tuck., Proc. Amer. Acad. Arts & Sci. 12: 181. 1877. —Rimularia psephota (Tuck.) Hertel & Rambold, in Hertel, Mitt. bot. StSamml., Münch. 23: 334. 1987.
Synonym: Lecidea rhizocarpiza Zahlbr., Deutsch. Südpolar. expedit. 1901-1903, 8: 36. 1906.

Thallus: medulla I+ violet.
Apothecia: epihymenium K+ violet

Chemistry: K+ red (acicular crystals in section), C-, KC-, Pd+ yellow, UV-; norstictic acid by TLC.

Ecology and distribution. Widely distributed on siliceous rocks in the southern subpolar region (cool-temperate to subantarctic), except the NZ shelf islands, and scattered in the corresponding region in the northern hemisphere.

Notes. Characterized by its thallus containing norstictic acid and with an I+ medulla, and by its K+ purple epihymenium. Collections from the subantarctic usuually have innate apothecia with a carbonaceous exciple but are otherwise indistinguishable from typical forms.

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Thallus (holotype)

Innate apothecia