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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 Data set not to be published after submission; 99-12-31.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: Moberg R. & Nash III T.H., Bryologist 102(1): 1-14 [9] (1999); Kurokawa S., Beih. Nova Hedwigia 6: 1-115 [49] (1962); Culberson W.L., Bryologist 69: 472-487 [483-4] (1966).

Thallus: Lobes convex; separate thallus parts narrow. Thallus Size and Differentiation: Small. Upper Surface: White, brown, or yellow; epruinose; eciliate; not isidate; sorediate; soralia brownish red, peripheral, labriform.

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

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