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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 Data set not to be published after submission; 99-12-31.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 [11-12] (1999); Moberg R. & Purvis W., Symbolae Botanicae Upsaliensis 32: 187-194 [192] (1997).

Thallus: Lobes plane; separate thallus parts narrow. Thallus Size and Differentiation: Small. Upper Surface: White or brown; epruinose; eciliate; not isidate; sorediate; soralia labriform or spathulate. Lower Surface: Rhizinate; rhizines pale brown.

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

Secondary Metabolites: Atranorin and hopane-6a,22-diol, provisional name(s): 'Heterodermia unknown spathulin'.

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