Hypocenomyce M. Choisy (1951)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Timdal E. (95-04-20, 99-06-02) and Scholz P. (02-05-15); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 10. Hypocenomyce. Biatoraceae A. Massal. ex Stiz. (1862); Lecanorineae; Lecanorales.

Type Information: Type: Hypocenomyce scalaris (Ach.) M. Choisy.

Taxonomic Literature: Taxonomic notes: excluding 3 species of Pycnora. Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero
Special 7: 1-893 [384-385] (1985); Dirig R., Mycotaxon 37: 441-462
(1990); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-
662 [188-189], Wellington (1985); Poelt J. & Vezda A., Biblioth.
Lichenol. 16: 1-390 [167-169] (1981); Purvis O.W. & James P.W.
in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and
Ireland, London (1992); Schneider G., Biblioth. Lichenol. 13: 1-291
(1979); Timdal E., Nord. J. Bot. 4: 83-108 (1984); Timdal E. in: Nash
T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert
Region vol. 1, 223-228, Tempe (2002).

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

Ecology: Biotroph; lichenized; terricolous, lignicolous, or corticolous; substrate non-calciferous.

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

Thallus: Crustose, squamulose or areolate (primarily areolate). Upper Surface: Grey, green, brown, olive, or brownish yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate or sorediate; not cephalodiate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent.

Medulla: Iodine reaction in Lugol's solution negative.

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 or directly at the thallus margin, soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: Black, green, brown, white, olive, or brownish yellow. Periphyses: Absent. Epithecium: Apical cells black, green, brown, olive, or brownish yellow. Hymenium: Iodine reaction: Lugol’s positive. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black, brown, or brownish yellow.

Asci: Tholus not thickened or thickened, amyloid, with non-amyloid narrow axial body and amyloid convergent flanks towards apex or with amyloid cap; ocular chamber indistinct; dehiscence lecanoralean; exoascus euamyloid.

Ascospores: c. 8 per ascus, ellipsoid, oblong, or fusiform, 4.5-14 µm long, 1.5-7 µm wide, obtuse; septa absent or present; transversally septate, 0-1-(3)-transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; sessile, formed all accross the thallus surface or along the thallus periphery.

Conidiogeneous Cells: Apical or intercalar. Conidia: Globose, filiform, or bacilliform; not branched; aseptate; cell wall hyaline.

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

(report generated 04.Okt.2007)