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Lecidea placodiiformis Hue

Data Set Maintenance: Data set standard item. Data set author(s): Hertel H. (99-01-01). Data set not revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Lecidea. Synonyms: Lecidea brunneoatra Vain., Lecidea gerlachii Zahlbr.; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Hue A.M., Deux Exped. Antarct. Francaise (1908-1910), Docum. Sci., Lichenes 99-101 (1915); type specimen label data: Antarctic Peninsula, Ile Jenny (baie Marguerite), 165 m, 15 January 1909, M. Gain, IIIe excursion no. 228 (PC, holotype).

Taxonomic Literature: Hertel H., Beih. Nova Hedwigia 79: 420-421 (1984); Hertel H., Mitt. Bot. München 28: 224 (1989).

Biogeography: Alpine. Continent: Antarctica (Antarctic Peninsula).

Ecology: Biotroph; lichenized; episubstratic; substrate non-calciferous.

Thallus: Areolate (primarily areolate), continuous throughout, dispersed along the periphery, continuous in the centre, or dispersed throughout and distinctly seperate; lobes rounded at the front; separate thallus parts.3-3.5 mm thick. Thallus Size and Differentiation: Large; main branches basally not constricted. Thallus Outline: Margin concolorous or brighter than disk (rather small) the thallus centre. Upper Surface: Brown (beige to light brown), convex; not sorediate; without thalloconidia thalloconidia.

Upper Cortex: Epicortex present. Medulla: Iodine reaction in Lugol's solution positive.

Ascocarps: Soon sessile, slightly constricted or strongly constricted at the base, 20-120 per cm², .6-1.3-(2.1) mm in diam.. Margin: Not flexuose or slightly flexuose, persistent or excluded, 20-80 µm wide, epruinose. Disk: Plane to weakly convex to rarely strongly convex, black, epruinose, pruina scarce, without an umbo. Exciple: Hyphae radiating outwards; grey; inspersed with crystals. Epithecium: Apical cells olive to green or normally turquoise. Hymenium: 37-63 µm high; white or pale green; iodine reaction: Lugol’s positive. Subhymenium: 0-30 µm high; white or pale green. Hypothecium: White or brownish yellow.

Ascospores: Ellipsoid, (5.5)-7.5-9.8-(12) µm long, (3)-3.5-4.3-(5) µm wide; wall not ornamented.

Secondary Metabolites: Present, confluentic acid, 2'-O-methylperlatolic acid, or 2'-O-methylmicrophyllinic acid.

Spot Tests: Medulla: K –, C –, PD – ascocarp margin (in section): K –, C – disk: C – hypothecium: K + purplish brown (chinoide reaction).

(report generated 04.Okt.2007)

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