Guide to Liverworts of Oregon: Key to Jungermannia 3
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Jungermannia 1a perianth exserted > Jungermannia 2b perianth fusiform, plicate > Jungermannia 3
Solenostoma rubrum - Perianth with tear from capsule emerging through small mouth. Lane Co., Oregon. DHW m2808
3a Perianth obovate, abruptly narrowed into a short, small beak, deeply 4-5 plicate; fertile shoot mostly erect, on rock or soil (Solenostoma subgenus Solenostoma)
(Couplet 4)
3b Perianth fusiform or tubular, narrowed to the mouth but not beaked, only shallowly plicate; prostrate plants mostly on wet rocks, dripping soil banks or aquatic (Jungermannia in the strict sense)
(Couplet 5)