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Ahtiana sphaerosporella (Müll. Arg.) Goward

Data Set Maintenance: Data set compiled (from Sonoran Desert Flora Vol. 1). Data set author(s): Bungartz F. (02-11-17) @EXCL@ Nash T.H. Data set to be published after submission; February 2002.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Ahtiana sphaerosporella (Müll. Arg.) Goward. Ahtiana. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Basionym: Parmelia sphaerosporella Müll. Arg. Type: Ahtiana sphaerosporella (Müll. Arg.) Goward.

Biogeography: Northern hemispheric; montane, upper montane, and subalpine. Continent: Northern America (in the Northwest). Checklist records: Sonoran Desert and United States and Canada (continental).

Ecology: Biotroph; lichenized; corticolous (conifers, rarely on Quercus).

Thallus: Foliose, subdivided into main parts, lobed; lobes elongate (linear); subconvex or convex. Thallus Size and Differentiation: (2)-4-6-(8) cm in diameter; apex rounded. Thallus Outline: Irregular or orbicular. Upper Surface: Light lime green (usually quite yellow, rarely becoming dark olive green), plane; convoluted; not pseudocyphellate; wrinkled; eciliate; not isidate; not sorediate. Lower Surface: Present, green (partly olivaceous), white, or pale grey; attached by holdfasts (true rhizines); wrinkled, wrinkles reticulate; rhizinate; rhizines sparse, moderately abundant, or abundant (towards the lobe tips), grey (concolorous or slightly darker than undersurface), white, or pale grey, usually not branched.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, forming in the thallus centre, independently from the host thallus or mycelium, soon sessile, abundant. Margin: Smooth, distinct. Disk: Plane, light brown, olive, or brownish yellow. Exciple: White. Amphithecium (thalline excipulum): Present.

Asci: Broadly clavate; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, spores 8 per ascus, globose, 4-6 µm long, 4-6 µm wide; septa absent.

Conidiomata: Present.

Conidiogeneous Cells: Intercalar. Conidia: Bifusiform; 5-7-(9) µm long; 1 µm wide.

Secondary Metabolites: Present; only in the upper part of the cortex or throughout the cortex, usnic acid.

Spot Tests: Cortex: KC – medulla: K –, C –, KC + yellow, PD –.

(report generated 04.Okt.2007)

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