Botanische Staatssammlung München © 1995–2008
Data remain intellectual property of the data set authors.

The description has been generated directly from a database. In cases of errors and insufficiencies consult the corresponding LIAS data entry and revision forms to make the necessary modifications. Changes will appear in the subsequent update of data entry forms and natural language descriptions. [To verify the actual status of the pages, select the reload frame function in the context menu!]
These pages are XHTML compatible designed. May be that problems arise with older web browser versions.

Data Set Maintenance: Data set compiled (from Sonoran Lichen Flora Vol.1). Data set author(s): Bungartz F. (02-02-07). Data set to be published after submission; February 2002.

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

Type Information: Basionym: Parmelia pulverulentula var. dimidiata Arnold. Type: Physcia dimidiata (Arnold) Nyl.

Biogeography: Colline and submontane. Continent: Europe, Northern America, and Southern America. Checklist records: Germany, Mexico, and Sonoran Desert.

Ecology: Biotroph; lichenized; lignicolous, corticolous, or saxicolous (in Sonoran Region mainly on N-exposed rock); episubstratic; growing sun-exposed or partially shaded; under conditions which are dry or moist.

Thallus: Foliose, subdivided into main parts, lobed; lobes ascending (at the tips); more or less imbricate; separate thallus parts up to (3) mm wide. Thallus Size and Differentiation: Up to (3) cm in diameter; apex rounded (not rounded but crenulate). Thallus Outline: Irregular or sometimes orbicular; margin lobulate; soon disappearing. Upper Surface: Grey (to cream), grey-brown, or pale grey, smooth; immaculate; pruina whitish; eciliate; without hairs; not isidate; sorediate; soralia grey or grey-brown, peripheral, soredia coarse; not blastidiate; not schizidiate; not lobulate. Lower Surface: Present, white or pale brown; attached by holdfasts (true rhizines); rhizinate; rhizines pale grey or brown, without projections, not branched (rhizines simple to sparsely furcate), sparsely furcate; not sorediate; not tomentose.

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

Ascocarps: Apothecioid, orbicular, soon sessile or substipitate, up to 2 mm in diam.. Margin: Lecanorine, persistent, distinct. Disk: Plane; pruinose, pruina abundant, white. Epithecium: With epithecium; apical cells subulate (clavate with dark brown cap). Hymenium: White; not inspers. Interascal Hyphae: Scarcely branched (paraphyses simple or forked above). Subhymenium: White. Hypothecium: White; not inspers.

Ascospores: Physcia-type, c. 8 per ascus, ellipsoid, 17-23 µm long, 8-12 µm wide; septa present; transversally septate; 1-transversally septate; wall thickened at the septum, becoming pigmented, dark brown (at maturity) or middle brown.

Secondary Metabolites: Present; only in the upper part of the cortex, atranorin.

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

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.

LIAS Home