Palicella xantholeuca
Palicella xantholeuca Fryday & Orange ined.
Basionym: Lecidea xantholeuca Müll. Arg., Nuov. Giorn. Bot. Ital. 21: 45 (1889).
Synonyms: Lecanora xantholeuca (Müll. Arg.) Hertel, Beih. Nova Hedwigia 79: 448 (1984).
Lecidea interrupta Darb., Wiss. Ergebn. Schweisch. Südpolarexpidit.1901-1903. 4: 3 (1912).
Lecidea protracta Darb., Wiss. Ergebn. Schweisch. Südpolarexpidit.1901-1903. 4: 4 (1912).—Lecidella protracta (Darb.) Hertel Beih. Nova Hedwigia 79: 450 (1984).
Description:
Superficially similar to L. capistrata but typically, with a smooth, continuous-rimose clear yellow thallus and apothecia with a persistent, raised proper margin with a much more developed exciple, and with shorter, bacilliform conidia 10-15(-18) µm long.
Distribution:
Known only from the Falkland Islands and Isla de los Estados, although several collections from Campbell Island refered to L. capistrata by Imshaug possibly belong here.
Remarks:
Lecidea protracta apparently differs from P. xantholeuca only in having pruinose apothecia that react Pd+ orange in section. As the type collection of L. protracta has mostly non-pruinose apothecia, I consider this insufficient grounds to recognise L. protracta as a distinct species and included it as a synonym of P. xantholeuca.
Hertel (1984) transfered Lecidea protracta to Lecidella but commented that it was very close to the Lecanora marginata group and that better developed material was required. Later (1992) he actually annotated the type species "Lecanora protracta", although he never published that combination.