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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 Data set not to be published after submission; 99-12-31.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 [7] (1999); Kurokawa S., Beih. Nova Hedwigia 6: 1-115 [74] (1962); Culberson W.L., Bryologist 69: 472-487 [483] (1966).

Thallus: Separate thallus parts narrow. Upper Surface: White; epruinose; ciliate; not isidate; sorediate. Lower Surface: Rhizines pale brown, brown, or black; sorediate.

Reproduction Strategy: Only known as sterile, asexually reproducing form. Ascocarps: Small. Margin: Lobulate.

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