Guide to Liverworts of Oregon: Key to Genera 45
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1b plants leafy > 3b leaves not divided, not ciliate > 6a oil bodies 2+ or unknown > 7b no small dorsal lobe > 10a succubous > 11a anisophyllous > 12b leaves lobed > 37b if rhizoids red, stems red > 38a shoots wider than 1 mm > 39a underleaves conspicuous > 40b underleaves narrow to lanceolate > 43b underleaves narrow to round > 45
Lophozia heterocolpos - Wahkeena, Multnomah Co., Oregon. DHW m1347c.
45a Terrestrial, never growing submerged; underleaves small, narrow; cell walls thick, with well developed, often bulging, trigones.
Lophozia
Rivulariella gemmipara - Three Sisters Wilderness, Lane Co., Oregon. DHW
m1769
45b Aquatic, submerged in running water; underleaves variable, from small flaps to rather large and round-lobed on the same shoot; cell walls thin, trigones lacking.
Rivulariella gemmipara