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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 Data set not to be published after submission; 99-12-31.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 or basionymous. Taxonomic rank: species. Heterodermia. Physciaceae Zahlbr. (1898).

Taxonomic Literature: Moberg R. & Nash III T.H., Bryologist 102(1): 1-14 [8-9] (1999); Brusse F., Bothalia 22: 183-185 [183] (1992).

Thallus: Lobes widening towards the apex; concave; separate thallus parts narrow. Thallus Size and Differentiation: Small. Upper Surface: Epruinose or pruinose; ciliate; not isidate; sorediate; soralia terminal, helmet-shaped. Lower Surface: Sorediate.

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, small.

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