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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 Data set not to be published after submission; 99-12-31.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 [5-7] (1999); Kurokawa S., Beih. Nova Hedwigia 6: 1-115 [58] (1962); Swinscow T. & Krog H., Lichenologist 8: 103-138 [122] (1976).

Thallus: Lobes widening towards the apex; separate thallus parts narrow or wide. Thallus Size and Differentiation: Small or large. Upper Surface: White, brown, or black; maculate; epruinose or pruinose; eciliate; not isidate; sorediate; soralia peripheral or laminal, labriform. Lower Surface: Rhizinate; rhizines black.

Reproduction Strategy: With sexual (and possible asexual) stages or only known as sterile, asexually reproducing form. Ascocarps: Small.

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

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