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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 Data set not to be published after submission; 99-12-31.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: Glenn M. et al. (eds.), Lichenographa Thomsoniana: 34 (1998); Moberg R. & Nash III T.H., Bryologist 102(1): 1-14 [3-4] (1999).

Thallus: Lobes with parallel margins; separate thallus parts narrow. Thallus Size and Differentiation: Small or large. Upper Surface: Ciliate; not isidate; not sorediate.

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

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