Thelocarpon Nyl. (1853)

Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Triebel D. (98-01-01; 00-11-1); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 18. Thelocarpon. Thelocarpaceae Zukal (1893); family of unknown placement (incertae sedis); Lecanorales.

Type Information: Type: Thelocarpon laureri (Flot.) Nyl.

Taxonomic Literature: Ahti T., Ann. Bot. Fenn. 10: 66-67 (1973); Aptroot A. & Sparrius L., Lichenologist 32: 513-514; Clauzade G. & Roux C.,
Bull. Soc. Bot. Centre-Ouest, N.S. 7: 1-893 [742-743] (1985); David
J.C. & Coppins B.J., Lichenologist 29: 291-294 (1997); Hafellner
J., Cryptog. Bot. 5: 99-104 (1995); Hafellner J. & Obermayer W.,
Cryptog. Bryol. Lichénol. 16: 177-190 (1995); Ihlen P.G.,
Lichenologist 30: 27-57 [54-56] (1998); Kocovrková-
Horáková J., Czech. Mycol. 50(4): 271-302 (1998); Nimis
P.C., Poelt J., Tetrach M., Ottonello D., Puntillo D. & Vezda A.,
Bull. Soc. Linn. Provençe 45: 247-262 [259] (1994); Olech M.
& Alstrup V., Nord. J. Bot. 9: 575-576 (1990); Poelt J. &
Hafellner J., Phyton (Horn) 17: 67-77 (1975); Poelt J. & Vezda
A., Biblioth. Lichenol. 38: 337-394 [387] (1990); Poelt J. &
Vezda A., Biblioth. Lichenol. 9: 1-258 [251-256] (1977); Rambold G.
& Triebel D., Biblioth. Lichenol. 48: 1-201 [130-131] (1992);
Salisbury G., Nova Hedwigia 25: 693-698 (1974); Salisbury G.,
Lichenologist 3: 175-196 (1966); Watson M.F., James P.W. & Moore
D.M. in: Purvis O.W., Coppins B.J., Hawksworth D.L., James P.W. &
Moore D.M. (eds), The lichen flora of Great Britain and Ireland: 1-
710 [595-598] (1992).

Biogeography: Checklist records: Austria, Germany, Great Britain, Italy, Sweden and Norway, and United States and Canada (continental).

Ecology: Saprobic or biotroph; lichenized, lichenicolous, or fungicolous; terricolous, lignicolous, corticolous, or epiphyllous; substrate non-calciferous or calciferous.

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

Thallus: Indistinct or crustose, not subdivided parts, granular. Upper Surface: Grey, green, yellow, brown, white, olive, or brownish yellow; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Medulla: Iodine reaction in Lugol's solution negative; not different with or without KOH pre-treatment (euamyloid).

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid or perithecioid, orbicular, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: Indistinct to prominent; external filaments absent. Exciple: Green, white, or brownish yellow. Periphyses: Absent or present. Epithecium: Apical cells green, yellow, hyaline, or brownish yellow. Hymenium: Iodine reaction: Lugol’s negative or Lugol’s positive, not hemiamyloid or hemiamyloid. Interascal Hyphae: Absent or present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: Green, white, or brownish yellow.

Asci: Tholus not thickened or thickened, not amyloid or amyloid, with amyloid tube or with amyloid cap; dehiscence lecanoralean or unitunicate; exoascus not amyloid or euamyloid, not hemiamyloid or hemiamyloid.

Ascospores: 12-16 or more than 32 per ascus, globose, ellipsoid, cylindrical, oblong-obtuse, oblong, or curved, 1.5-17 µm long, 1-9 µm wide, obtuse or aciculate; septa absent or present; transversally septate, 1-transversally septate; wall thin, not thickened at the septum, laterally constricted where the septum meets the spore wall, 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.

Conidiogeneous Cells: Apical. Conidia: Fusiform or bacilliform; aseptate or septate; 1-2-septate.

Secondary Metabolites: Not detected or present, of the following substance class(es): pulvinic acid derivatives.

(report generated 04.Okt.2007)