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Placocarpus Trevis. (1860)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Placocarpus. Verrucariaceae Zenker (1827); Verrucariales.

Type Information: Type: Placocarpus schaereri (Fr.) Breuss (1860).

Taxonomic Literature: Breuss O., Pl. Syst. Evol. 148: 313-315 (1985); Rambold G. & Triebel D., Biblioth. Lichenol. 48: 1-201 [152-153] (1992); Trevisan V., Conspectus Verrucarinarum, Bassano: 1-20 [20] (1860); Zehetleitner G., Nova Hedwigia 29: 683-734 (1978).

Biogeography: Checklist records: Austria, Germany, and Italy.

Ecology: Biotroph; lichenized or lichenicolous; substrate calciferous.

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

Thallus: Crustose or foliose, rimose, umbilicate (subumbilicate). Thallus Outline: Soon disappearing or persistent. Upper Surface: Black; special structures absent. Lower Surface: Attached by the whole lower surface or attached by holdfasts; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, forming all across the thallus surface, not emerging. Margin: Indistinct; external filaments absent. Periphyses: Present. Epithecium: Apical cells black. Interascal Hyphae: Present?, scarcely branched, not or scarcely anastomosed.

Ascospores: c. 8 per ascus, clavate or oblong-obtuse, 18-32 µm long, 8-12 µm wide, obtuse; septa absent; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)

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