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

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Arctoparmelia subcentrifuga (Oxner) Hale. Arctoparmelia. Synonyms: Parmelia groenlandica Lynge
Xanthoparmelia subcentrifuga (Oxner) Hale; Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Basionym: Parmelia subcentrifuga Oxner. Type: Arctoparmelia subcentrifuga (Oxner) Hale.

Biogeography: Arctic, subarctic, and boreal; upper montane. Continent: Northern America. Checklist records: United States and Canada (continental).

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Trebouxia; Trebouxiaceae; Trebouxiales.

Thallus: Foliose, subdivided into main parts, lobed; lobes elongate, imbricate; separate thallus parts.6-3 mm wide. Thallus Size and Differentiation: 4-8 cm in diameter; apex rounded. Thallus Outline: Irregular or orbicular. Upper Surface: Grey-yellow or lime green, convex, smooth, pulverulaceous (but cracked with age); fissurate (in old thalli); convoluted; not pseudocyphellate; eciliate; not isidate; sorediate; soralia subperipheral or peripheral, erupting from pustules, irregular or linear. Lower Surface: Present, black or grey, purplish black in the centre, grey along the margin; attached by holdfasts (true rhizines); rhizinate; rhizines sparse, black.

Reproduction Strategy: Only known as sterile, asexually reproducing form (not seen).

Secondary Metabolites: Present; throughout the cortex (atranorin, chloratranorin and usnic acid) or throughout the thallus medulla, alectoronic acid, atranorin, chloroatranorin, or usnic acid.

Spot Tests: Cortex: KC – or + deep yellow (depending on atranorin concentration), C –, KC + red (yellow, not red), PD + yellow; medulla: K –, C –, KC –, PD –.

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