Diploschistes Norman

Data Set Maintenance: Data set standard item. Data set author(s): Lumbsch H. T. & Guderley R. Data set reviewer(s): Lumbsch H. T. (94-12-28, 99-09-06), Rambold G. (01-02-22), Scholz P. (02-05-14, 06-06-12), and Sipman H. (98-01-15); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 21-35. Diploschistes. Thelotremataceae (Nyl.) Stizenb. (1862); Ostropales.

Type Information: Type: Diploschistes scruposus (Schreb.) Norman.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest, N.S. 7: 1 893 [354-356] (1985); Galloway D.J., Flora of New Zealand. Lichens: 1 662 [160-161] (1985); Hawksworth D.L. 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 [236-238] (1992); Kondratyuk S.Y.A. & Zelenko S.D., Ukrayins'k. Bot. Zhurn. 59(5): 598-607 (2002); Lumbsch H.T., Lichenologist 20: 19-24 (1988); Lumbsch H.T., J. Hattori Bot. Lab. 66: 133-196 (1989); Lumbsch H.T. in Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonora Region vol. 1, 173-178, Tempe (2002); Prant G. & Upreti D.K., Lichenologist 25: 33-50 (1993).

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

Ecology: Biotroph; lichenized or lichenicolous; bryophytic or lignicolous; substrate non-calciferous or calciferous.

Lichen Photobionts: Primary photobiont absent or present; chlorococcal. Primary photobiont taxonomy: Asterochloris and Trebouxia (A. Beck 22-05-97); Trebouxiaceae; Trebouxiales, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, rimose. Thallus Outline: Soon disappearing. Upper Surface: White, grey (to whitish grey), brownish yellow, or brown (brownish grey); special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Medulla: Iodine reaction in Lugol's solution negative or in Lugol's solution positive; 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, orbicular, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Wall: Not carbonized, not fused. Margin: Distinct to prominent; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells hyaline, black, brownish yellow, or brown. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White, black, brownish yellow, or brown.

Asci: Tholus thickened, not amyloid; dehiscence unitunicate; exoascus not amyloid, not hemiamyloid.

Ascospores: 1–2 to c. 8 per ascus, broadly ellipsoid, 16-54 µm long, 8-24 µm wide, obtuse; septa present; both transversally and longitudinally, formed by the proper spore wall; wall thin, not thickened at the septum, not constricted where the septum meets the spore wall, hyaline or dark brown, in Lugol's Solution negative or in Lugol's Solution positive, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed or stipitate, formed all accross the thallus surface.

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

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

(report generated 04.Okt.2007)