Botanische Staatssammlung München © 1995–2008
Data remain intellectual property of the data set authors.

The description has been generated directly from a database. In cases of errors and insufficiencies consult the corresponding LIAS data entry and revision forms to make the necessary modifications. Changes will appear in the subsequent update of data entry forms and natural language descriptions. [To verify the actual status of the pages, select the reload frame function in the context menu!]
These pages are XHTML compatible designed. May be that problems arise with older web browser versions.

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. Taxonomic rank: genus. Number of known taxa within this rank: 34. Placopsis. Synonyms: Aspiciliopsis (Müll. Arg.) M. Choisy (1929); Agyriaceae Corda (1838); Agyriineae; Lecanorales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M.,
Biblioth. Lichenol. 64: 1-220 [137] (1997); Brodo I.M. in Knoph J.-
G., Schrüfer K. & Sipman H.J.M., Biblioth. Lichenol. 57: 59-
70 (1995); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-
662 [399-409], Wellington (1985); Lamb, I.M., Lilloa 13: 151-288
(1947); Lumbsch H.T., J. Hattori Bot. Lab. 83: 1-73 (1997); Lumbsch
H.T., Kashiwadani H., Streimann H., Pl. Syst. Evol. 185: 285-292
(1993); Purvis O.W. in: Purvis O.W. et al. (eds), The Lichen Flora of
Great Britain and Ireland, London (1992).

Biogeography: Checklist records: Austria, Bolivia, Germany, Great Britain, Italy, New Guinea, New Zealand, Sweden and Norway, United States and Canada (continental), and Republic of South Africa.

Lichen Photobionts: Primary photobiont present; chlorococcal. Secondary photobiont absent or present. Secondary photobiont taxonomy: Nostoc, Scytonema, and Stigonema, Nostocaceae, Scytonemataceae, and Stigonemataceae, Stigonematales, Cyanobacteria, Prokaryota.

Thallus: Indistinct or crustose, not subdivided parts, placodioid, granular, rimose, or areolate (primarily areolate). Upper Surface: Grey, red, white, brownish yellow, or orange; special structures present:; not pseudocyphellate; eciliate; without hairs; isidiate; sorediate; cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; 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, becoming adnate to substipitate. Margin: Distinct to prominent; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells yellow, brown, or brownish yellow. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: White or brownish yellow.

Asci: Tholus thickened, not amyloid; dehiscence lecanoralean; exoascus euamyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid or oblong, 12-30 µm long, 6-21 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; pycnidial; immersed, formed all accross the thallus surface.

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

In case that additional characters and states are required to be included in this data set, consult the LIAS Instructions to Participants and follow the procedures described there.

LIAS Home