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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 nigerrima H.Magn., Lecidea pernigra Hertel; Lecideaceae Chevall. (1826); Lecanorales.

Type Information: Protologue: Nylander W. in Sandstede H., Abhandl. Nat. Ver. Bremen 14: 490 (1898); type specimen label data: Germany, Niedersachsen: an Granitgeröll einer Sandwehe bei Bookholtsberg bei Gruppenbüren, H. Sandstede.

Taxonomic Literature: Taxonomic notes: Variability of characters insufficiently known. Hawksworth D.L., Coppins, B.J. in Purvis O.W. et al. 333 (1992); Hertel H., Biblioth. Lichenol. 58: 168 (1995).

Ecology: Biotroph; lichenized; endosubstratic or episubstratic (traces only); substrate non-calciferous.

Thallus: Not subdivided parts, dispersed throughout and distinctly seperate; lobes angular at the front; separate thallus parts 0-.1 mm thick. Thallus Size and Differentiation: Large or small; main branches basally not constricted. Thallus Outline: Margin concolorous the thallus centre. Upper Surface: White, plane; not sorediate; without thalloconidia thalloconidia.

Medulla: Iodine reaction in Lugol's solution negative or in Lugol's solution positive.

Ascocarps: Soon sessile, slightly constricted or strongly constricted at the base, 20-110 per cm², .35-.8-(1.4) mm in diam.. Margin: Not flexuose, persistent or excluded, indistinct, 35-70 µm wide, rarely epruinose. Disk: Plane, weakly convex, or strongly convex, black, epruinose, without an umbo. Exciple: Hyphae radiating outwards; 3-6 µm wide; brown (very pale); not inspersed with crystals. Epithecium: Apical cells olive, cell pigment reacting with 10% HCl (in H2O). Hymenium: 35-65 µm high; white; iodine reaction: Lugol’s positive. Subhymenium: 20-30 µm high; white. Hypothecium: Brown.

Ascospores: Ellipsoid or oblong, (9)-10.8-16-(20) µm long, (3.5)-3.8-4.5-(5.5) µm wide; wall not ornamented.

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

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