Six species of Candelariella with polysporous asci are recognized from western North America. The species are: C. borealis sp. nov., C. efflorescens, C. lutella, C. placodizans, C. vitellina and C. xanthostigma. Candelariella vitellina is lectotypified. A key to the polysporous species in western North America is provided and their distribution in the study area is mapped.
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Martin Westberg (2007) studied this question.
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