Dibaeis Clem. (1909)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Koch A. (96-03-01) and Scholz P. (02-05-14); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 13. Dibaeis. Icmadophilaceae Triebel (1993); Leotiales.

Type Information: Type: Dibaeis baeomyces (L. fil.) Rambold & Hertel.

Taxonomic Literature: Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [201-
202], Wellington (1985); Gierl C. & Kalb K., Herzogia 9: 593-645
(1993); Ihlen P.G., Graphis Scripta 8: 33-39 (1997); Rambold G.,
Triebel D. & Hertel H., Biblioth. Lichenol. 53: 217-240 (1993);
Ryan B.D. & Kalb K. in Nash T.H. III et al. (eds) Lichen Flora of
the Greater Sonoran Desert Region vol. 1, 168-169, Tempe (2002).

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

Ecology: Biotroph; lichenized; substrate non-calciferous.

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Coccomyxa (A. Beck 22-05-97); genus incertae sedis; family of unknown placement (incertae sedis), Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts, granular or rimose. Upper Surface: Grey, green, brown, olive, or brownish yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; 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, forming all across the thallus surface or directly at the thallus margin, directly at the tip of the thallus parts, soon sessile to stipitate. Margin: Indistinct to distinct; external filaments absent. Exciple: White. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus thickened, amyloid, with amyloid cap; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, filiform, oblong, or fusiform, 7-24-(30) µm long, (2)-2.7-5-(8) µm wide, obtuse or aciculate; septa absent or occasionally present; transversally septate, 0-3-transversally septate; 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.

Conidiogeneous Cells: Intercalar. Conidia: Bacilliform; aseptate.

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

(report generated 04.Okt.2007)