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Physcia convexella Moberg

Data Set Maintenance: Data set compiled (Sonoran Desert Lichen Flora Vol.1). Data set author(s): Bungartz F. (02-02-01). Data set to be published after submission; February 2002.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Physcia convexella Moberg. Physcia. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Type Information: Basionym: Physcia convexella Moberg.

Biogeography: Coastal, colline, submontane, and montane. Continent: Northern America and Southern America. Checklist records: Mexico and Sonoran Desert.

Ecology: Biotroph; lichenized; saxicolous; episubstratic; growing sun-exposed; under conditions which are dry or moist.

Thallus: Foliose, subdivided into main parts, lobed; lobes widening towards the apex; plane; sometimes imbricate; separate thallus parts up to (1) mm wide. Thallus Size and Differentiation: Up to (2) cm in diameter; apex truncate. Thallus Outline: Sometimes irregular or orbicular; margin darkened the thallus centre. Upper Surface: Grey, white, or pale grey, glossy (shiny), smooth; maculate; pruinose; pruina scarce; whitish; eciliate; without hairs; not isidate; not sorediate; not blastidiate; not schizidiate. Lower Surface: Present, white (with a rose tinge); attached by holdfasts (true rhizines); rhizinate; rhizines sparse, white (to pale rose, concolorous with thallus undersurface), not branched or branched (rhizines simple to sparsely furcate), sparsely furcate.

Upper Cortex: Present; outer cortical layer paraplectenchymatous; inner cortical layer prosoplectenchymatous. Medulla: White. Lower Cortex: Present.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Orbicular, soon sessile or substipitate, abundant, up to 2 mm in diam.. Margin: Lecanorine, crenulate, persistent, distinct or prominent; not isidiate; not ciliate; not hirsute. Disk: Plane; black or brown; epruinose. Epithecium: With epithecium (simple or forked); apical cells subulate (clavate with dark brown cap), pale brown. Hymenium: White; not inspers. Interascal Hyphae: Scarcely branched, not or scarcely anastomosed. Subhymenium: White. Hypothecium: White; not inspers.

Asci: Cylindrical.

Ascospores: Physcia-type and Pachysporaria-type, c. 8 per ascus, ellipsoid, 15-18 µm long, 7.5-8 µm wide; septa present; transversally septate; 1-transversally septate; wall thickened at the septum, becoming pigmented, dark brown (at maturity) or middle brown.

Conidiomata: Present; strongly abundant.

Conidia: Bacilliform (not bacilliform but cylindrical); 4-6 µm long; 1 µm wide.

Secondary Metabolites: Present; only in the upper part of the cortex, atranorin (and triterpenes).

Spot Tests: Present reactions. Upper surface: K + deep yellow, C –, KC –, PD + yellow; cortex: KC + deep yellow, soredia: K – KC –.

(report generated 13.Nov.2007)

In case that additional characters and states are required to be included in this data set, consult the LIAS Instructions to Participants and follow the procedures described there.