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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 Data set not to be published after submission; 99-12-31.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 [4-5] (1999); Kurokawa S., Beih. Nova Hedwigia 6: 1-115 [37] (1962); Culberson W.L., Bryologist 69: 472-487 [482] (1966).

Thallus: Lobes convex or plane; separate thallus parts narrow. Thallus Size and Differentiation: Small. Upper Surface: White or brown; pruinose; eciliate; isidiate; not sorediate or sorediate; soralia laminal, labriform.

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

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