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Acanthotrema A. Frisch (2006)

Data Set Maintenance: Data set standard item; reviewer(s): Scholz P. (07-07-27); not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 1. Synonyms: Thelotrema (= T. brasilianum); Thelotremataceae (Nyl.) Stizenb. (1862); Ostropales.

Type Information: Type: Acanthotrema brasilianum (Hale) A. Frisch.

Taxonomic Literature: Frisch A., Biblioth. Lichenol. 92: 3-370 [77-81] (2006); Hale M.E. in Kalb K., Lichenes Neotrop. 7: 15 (1983); Sipman H.J.M., Trop. Bryol. 6: 1-31 [10] (1992).

Ecology: Biotroph; lichenized; corticolous.

Lichen Photobionts: Primary photobiont present; trentepohlioid. Primary photobiont taxonomy: Eukariota. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, rimose. Upper Surface: Grey or olive; special structures absent; isidiate. Lower Surface: Not attached, thallus vagrant; special structures absent.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular or compact stellate, forming all across the thallus surface, not emerging. Wall: Not carbonized, not fused. Margin: Prominent; external filaments absent. Periphyses: Present (periphysoids along inner surface of proper exciple). Epithecium: Apical cells hyaline. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus thickened, not amyloid; ocular chamber indistinct; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, 9-12 µm long, 4.5-6.5 µm wide, obtuse; septa present; sub-both transversally and longitudinally, 1-2-transversally septate; wall thin, not thickened at the septum, laterally constricted where the septum meets the spore wall, hyaline, in Lugol's Solution positive, wall not ornamented.

Conidiomata: Present; pycnidial; immersed (in smaqll thallus wards), formed all accross the thallus surface.

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

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)

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