Guide to Liverworts of Oregon: Key to Porella 3
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Porella 1b plants not peppery tasting> 2a underleaves frequently toothed > 3
Porella bolanderi
3a Ventral lobes decurrent; underleaves triangular, only slightly wider than stem; leaves typically densely undulate-imbricate, spreading; IKI negative; in Garry oak zone
Porella bolanderi
Porella arboris-vitae
3b Ventral lobes hardly decurrent; underleaves ovate, twice as wide as stem; leaves imbricate but not undulate, +/- ascending; known only from the Columbia River Gorge
Porella arboris-vitae