Ptychographa Nyl. (1874)
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: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 2. Ptychographa. Genus of unknown placement (incertae sedis); Agyriineae; Lecanorales.
Type Information: Type: Ptychographa xylographoides Nyl.
Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [649] (1985); Coppins B.J. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Poelt J., Bestimmungsschlüssel Europäischer Flechten: 1-757 [546] (1969).
Biogeography: Checklist records: Austria, Germany, Great Britain, Italy, and Sweden and Norway.
Ecology: Biotroph; lichenized; lignicolous.
Lichen Photobionts: Primary photobiont present; chlorococcal. Secondary photobiont absent.
Thallus: Indistinct or crustose, not subdivided parts, granular. Upper Surface: Brown; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate or sorediate; not cephalodiate; not lobulate; without granules or with 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 or linear, forming all across the thallus surface, soon sessile. Margin: Prominent; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black or brown.
Asci: Dehiscence lecanoralean.
Ascospores: c. 8 per ascus, ellipsoid, 6-14 µm long, 3-6.5 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 or sessile, formed all accross the thallus surface.
Conidia: Bacilliform.
Secondary Metabolites: Not detected.
(report generated 04.Okt.2007)
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