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Data Set Maintenance: Data set standard item. Data set author(s): Schramm R. & Nash T. H. (99-06-25). Data set not to be published after submission; 99-12-31.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Heterodermia. Physciaceae Zahlbr. (1898).

Taxonomic Literature: Swinscow T. & Krog H., Lichenologist 8: 103-138 [113] (1976); Moberg R. & Nash III T.H., Bryologist 102(1): 1-14 [2] (1999); Kurokawa S., Beih. Nova Hedwigia 6: 1-115 [80] (1962).

Biogeography: Continent: Northern America, Africa, Southern America, and Europe.

Thallus: Lobes widening towards the apex; convex; separate thallus parts narrow. Thallus Size and Differentiation: Small. Upper Surface: White, grey, or brown; epruinose; eciliate; not isidate; sorediate; soralia pale grey, peripheral, labriform. Lower Surface: Rhizines brown or black.

Secondary Metabolites: Atranorin, hopane-6a,22-diol, and salazinic acid, metabolite(s) of unresolved identity: present.

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