Guide to Liverworts of Oregon: Key to Jungermannia 6
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Jungermannia 1a perianth exserted > Jungermannia 2b perianth fusiform, plicate > Jungermannia 3b perianth fusiform, not beaked > Jungermannia 5b leaves ovate, spreading > Jungermannia 6
6a Paroicous (sexuality only accurate diagnostic character); often with a greasy kakhi color; often in still water; some forms with small, concave, overlapping leaves; not common
Jungermannia pumila (and Jungermannia polaris)
6b Dioicous; often bright green with dark or blackish tones; usually in running water; common; most often at lower elevations
Jungermannia atrovirens