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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 Data set not to be published after submission; 99-12-31.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 [4] (1999); Kurokawa S., Beih. Nova Hedwigia 6: 1-115 [103] (1962); Follmann G. & J. Redon, Willdenowia 6: 431-460 [46] (1972).

Thallus: Lobes convex; separate thallus parts narrow or wide. Thallus Size and Differentiation: Small or large. Upper Surface: White; ciliate; not isidate; not sorediate. Lower Surface: Rhizinate; rhizines pale brown.

Reproduction Strategy: With sexual (and possible asexual) stages or only known as sterile, asexually reproducing form. Ascocarps: Forming directly at the tip of the thallus parts, large. Margin: Lobulate; ciliate.

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