Medusulina Müll. Arg. (1894)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): 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: 6. Medusulina. Graphidaceae Dumort. (1822); Ostropales.

Type Information: Type: Medusulina paraguayana Müll. Arg.?

Taxonomic Literature: Redinger K., Ark. Bot. 25A(13): 1-20 (1933).

Biogeography: Checklist records: United States and Canada (continental) and Guianas.

Ecology: Biotroph; lichenized; corticolous.

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

Thallus: Crustose, not subdivided parts. Thallus Outline: Soon disappearing. Upper Surface: Grey or brownish yellow; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, lingulate, linear, or irregular, forming all across the thallus surface, not emerging, becoming adnate. Margin: Distinct to prominent; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black or brown.

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

Ascospores: c. 8 per ascus, ellipsoid or oblong, 24-30 µm long, 7-10 µm wide, obtuse; septa present; both transversally and longitudinally, 4-8-transversally septate, formed by the endospore wall layer; wall not thickened at the septum, hyaline, in Lugol's Solution negative.

Conidiomata: Absent resp. not observed or present.

Secondary Metabolites: Not detected or present, of the following substance class(es): ß-orcinol depsidones.

(report generated 04.Okt.2007)