Guide to Liverworts of Oregon: Key to Porella 2
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Porella 1b plants not peppery tasting> 2
Left: Porella bolanderi; right: Porella arboris-vitae
2a Leaves and underleaves frequently toothed, especially noticeable on ventral lobes of lateral leaves; IKI negative (but unknown in P. arboris-vitae); rare to very rare in Oregon
(Couplet 3)
Left: Porella navicularis; right: Porella cordaeana
2b Leaves and underleaves entire or with occasional teeth at base of underleaves and lobules; IKI positive or negative; common species
(Couplet 4)