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Lecidea siderolithica Müll. Arg.

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

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: species. Lecidea. Synonyms: Lecidea nigrogrisea Nyl.; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Müller-Argau J., Flora 55: 535-536 (1872); type specimen label data: France, Dépt. Haute-Savoie, in summitate montis Salève ad saxa siderolithica, 15 September 1872, J. Müller-Argau (G, lectotype).

Taxonomic Literature: Taxonomic notes: Near to Lecidea fuscoatra; variability of characters insufficiently known. Hertel H., Biblioth. Lichenol. 58: 171 (1995); sub Lecidea nigrogrisea: Sandstede H., Abhandl. Naturw. Ver. Bremen 21: 80 (1912); Hawksworth D.L., Coppins B.J. in Purvis O.W. et al. 332-333 (1992).

Biogeography: Colline and montane. Continent: Europe (Au, Br, Ga, Ge, It) and Asia-Temperate (China).

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

Thallus: Areolate (primarily areolate), subsquamulose, continuous throughout, dispersed along the periphery, continuous in the centre, or dispersed throughout and distinctly seperate; lobes angular or rounded at the front; separate thallus parts.2-.35 mm thick. Thallus Size and Differentiation: Large; main branches basally not constricted. Thallus Outline: Margin concolorous the thallus centre. Upper Surface: Brownish yellow, grey (with a tinge of olive), or brown (very pale brown), convoluted, plane or convex; not sorediate; without thalloconidia thalloconidia.

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

Ascocarps: Soon sessile, slightly constricted at the base, 25-130 per cm², .4-.9-(1.8) mm in diam.. Margin: Not flexuose or slightly flexuose, persistent or excluded, 50-140 µm wide, epruinose. Disk: Plane to strongly convex, black, epruinose, without an umbo. Exciple: Hyphae radiating outwards; 2.5-4 µm wide; grey or brown; not inspersed with crystals or inspersed with crystals. Epithecium: Apical cells olive or brown, cell pigment reacting with 10% HCl (in H2O). Hymenium: 45-72 µm high; white; iodine reaction: Lugol’s positive. Subhymenium: 15-27 µm high; white. Hypothecium: Brown or dark brown.

Ascospores: Ellipsoid or oblong, (6)-7.3-12.4-(15.5) µm long, (2.5)-3.6-6.4-(7.1) µm wide; wall not ornamented.

Conidia: (6)-7.9-11.2-(12) µm long.

Secondary Metabolites: Present, gyrophoric acid and lecanoric acid.

Spot Tests: Medulla: K –, C – or + red, PD – ascocarp margin (in section): K –, C – or + red; disk: C – hypothecium: K – epihymenium: K –.

(report generated 04.Okt.2007)

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