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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 adscendens (Fr.) H. Olivier. Physcia. Synonyms: Physcia adscendens Bitt. nom. illeg.; later homonym of Physcia
adscendens (Fr.) H. Olivier; Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Type Information: Basionym: Parmelia stellaris var. adscendens Fr. Type: Physcia adscendens (Fr.) H. Olivier.

Biogeography: Northern hemispheric; boreal (-temperate); submontane, montane, and upper montane. Continent: Asia-Temperate, Europe, and Northern America. Checklist records: Germany, Great Britain, Mexico, Sonoran Desert, Sweden and Norway, and United States and Canada (continental).

Ecology: Biotroph; lichenized; lignicolous, corticolous, or rarely saxicolous; episubstratic; growing sun-exposed or partially shaded; under conditions which are dry or moist.

Thallus: Foliose or crustose, subdivided into main parts, subfruticose, lobed; lobes with parallel margins (the lobe margins are parallel, but widening at the tip to form the helmet-shaped soralia), horizontal or ascending. Thallus Size and Differentiation: Small; (.1)-1-(2) cm in diameter. Thallus Outline: Irregular; soon disappearing. Upper Surface: Grey (to dark grey), white, or pale grey, matt or glossy (shiny), smooth; immaculate; rarely pruinose; pruina scarce; whitish; ciliate; cilia slender; without hairs; not isidate; sorediate; soralia grey, white, or pale green, terminal, helmet-shaped, isolated, not confluent with other soralia, soredia coarse; not blastidiate; not schizidiate; not lobulate. Lower Surface: Present, grey, white, or pale grey, loosely attached attached; attached by holdfasts (true rhizines); rhizinate; rhizines sparse, black, grey, or white, not branched; sorediate.

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

Reproduction Strategy: Only known as sterile, asexually reproducing form (not observed in Sonoran Material). Ascocarps: Orbicular, substipitate (-stipitate), sparse, small. Margin: Lecanorine, smooth, persistent, prominent. Disk: Black; sometimes pruinose, pruina scarce, white.

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 –.

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