Haematomma A. Massal. (1852)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Staiger B. (98-10-22); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 10. Haematomma. Haematommataceae Hafellner (1984); Lecanorineae; Lecanorales.

Type Information: Type: Haematomma ochroleucum (Neck.) J.R. Laundon.

Taxonomic Literature: Coppins B.J. & Brightman F.H. in: Purvis O.W. et al. (eds), The
Lichen Flora of Great Britain and Ireland, London (1992); Culberson
W.L., Bryologist 66: 224-236 (1963); Galloway D.J., Flora of New
Zealand Lichens: i-lxxiii, 1-662 [180-181], Wellington (1985); Poelt
J. & Vezda A., Biblioth. Lichenol. 9: 1-258 [121-124] (1977);
Rogers R.W., Lichenologist 14: 115-129 (1982); Rogers R.W.,
Lichenologist 17: 307-309 (1985); Rogers R.W. & Bartlett J.K.,
Lichenologist 18: 247-255 (1986); Rogers R.W. & Hafellner J.,
Lichenologist 20: 167-174 (1988); Staiger B. & Kalb K., Biblioth.
Lichenol. 59: 1-198 (1995).

Biogeography: Checklist records: Austria, Germany, Great Britain, Guianas, Italy, New Zealand, Sonoran Desert, Sweden and Norway, Thailand, United States and Canada (continental), Namibia, and Republic of South Africa.

Ecology: Biotroph; lichenized; corticolous; substrate non-calciferous.

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

Thallus: Crustose, not subdivided parts, granular, rimose, or areolate (primarily areolate). Upper Surface: Grey, white, olive, or brownish yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate or sorediate; not 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 or irregular, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: Indistinct to prominent; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells brown, red, brownish yellow, or orange. Hymenium: Oil inspersed, iodine reaction: Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: White.

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

Ascospores: c. 4 to c. 8 per ascus, fusiform or filiform, 20-90 µm long, 3-7.5 µm wide, aciculate; septa present; transversally septate or both transversally and longitudinally, 3-25-transversally septate; 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 bacilliform.

Secondary Metabolites: Present, of the following substance class(es): orcinol depsides, ß-orcinol depsides, ß-orcinol depsidones, (higher) aliphatic acids, (tri-)terpenoids, (anthra-)quinones, xanthones, and dibenzofurans [and usnic acids].

(report generated 04.Okt.2007)