Placoparmelia Henssen (1992)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Elix J. A. (95-06-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Placoparmelia. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Type: Placoparmelia patagonica Henssen.

Taxonomic Literature: Elix J.A., Bryologist 96: 359-383 (1993); Henssen A., Lichenologist 24: 133-142 (1992).

Ecology: Biotroph; lichenized; substrate non-calciferous.

Lichen Photobionts: Primary photobiont present; chlorococcal. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, squamulose. Upper Surface: Brown; special structures absent. Lower Surface: Attached by the whole lower surface or attached by holdfasts; special structures absent.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming all across the thallus surface, not emerging. Margin: Indistinct to distinct; external filaments absent. Exciple: Grey or white. Periphyses: Absent. Epithecium: Apical cells brown or brownish yellow. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus thickened, amyloid, with non-amyloid wide axial body and divergent amyloid flanks towards apex; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, ellipsoid or broadly ellipsoid, 3.5-7 µm long, 3.5-6 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed, formed all accross the thallus surface.

Conidia: Filiform or bifusiform.

Secondary Metabolites: Present, of the following substance class(es): ß-orcinol depsidones.

(report generated 04.Okt.2007)