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The 2013 Oregon Biodiversity Information Center's (ORBIC) species of concern list identifies one hornwort, 39 liverworts and 102 moss species occurring in Oregon as rare, threatened or endangered. This Bureau of Land Management publication provides for each species current nomenclature, distinctive taxonomic characteristics, technical description, similar species, ecology, mapped known distributions, references, and a photomicrograph plate. Rare Bryophytes of Oregon gives a much-needed review of known species locations by both county and ecoregions. Additionally, Rare Bryophytes of Oregon includes species proposed for inclusion into the 2016 ORBIC list.
Ronald L. Exeter is a botanist for the Marys Peak Field Office. Judith Harpel is an Adjunct Professor and Curator of Bryophytes. David Wagner is an independent botanist specializing in bryophytes and ferns.