Stotler, R.E. and Crandall-Stotler, B. 2017. A snyopsis of the liverwort flora of North America north of Mexico. Annals of the Missouri Botanical Garden 102(4): 574-709.
pg. 661 Stotler and Crandall-Stotler explain this synonymy based on two molecular studies Vilnet et al. (2012) and Aranda et al. (2014), as well as the interpretation that O. prostratum and O. sphagni are different morphological and ecological expressions of one species (Schuster 1974).
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Added by bouteloua on February 8, 2021 02:55 PM
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Committed by bouteloua on February 8, 2021
Unintended disagreements occur when a parent (B) is
thinned by swapping a child (E) to another part of the
taxonomic tree, resulting in existing IDs of the parent being interpreted
as disagreements with existing IDs of the swapped child.
Identification
ID 2 of taxon E will be an unintended disagreement with ID 1 of taxon B after the taxon swap
If thinning a parent results in more than 10 unintended disagreements, you
should split the parent after swapping the child to replace existing IDs
of the parent (B) with IDs that don't disagree.