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Physcidia Tuck. (1862)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 7. Physcidia. Synonyms: Megalopsora Vain. (1921); Biatoraceae A. Massal. ex Stiz. (1862); Lecanorineae; Lecanorales.

Type Information: Type: Physcidia wrightii (Tuck.) Tuck.

Taxonomic Literature: Kalb K. & Elix J.A. in Knoph J.-G., Schrüfer K. & Sipman H.J.M., Biblioth. Lichenol. 57: 265-296 (1995); Tuckerman E., Proc. Am. Acad., Arts Sci. 5: 383-422 [400-401] (1862).

Biogeography: Checklist records: Guianas and Thailand.

Ecology: Biotroph; lichenized; corticolous.

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

Thallus: Crustose or foliose, not subdivided parts, squamulose, lobed. Thallus Outline: Persistent. Upper Surface: Green, grey, or brownish yellow; special structures present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures 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, forming all across the thallus surface, soon sessile. Margin: External filaments absent. Exciple: White. Periphyses: Absent. Hypothecium: White.

Asci: Tholus thickened, amyloid, with non-amyloid narrow axial body and amyloid convergent flanks towards apex; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, filiform, 15-40 µm long, 1.5-3 µm wide, obtuse; septa present; transversally septate, 1-3-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present.

Conidia: Bacilliform.

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

(report generated 04.Okt.2007)


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