Guide to Liverworts of Oregon: Key to Jungermannia 4
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Jungermannia 1a perianth exserted > Jungermannia 2b perianth fusiform, plicate > Jungermannia 3a perianth obovate, beaked > Jungermannia 4
Solenostoma rubrum - Perianth with tear from capsule emerging through small mouth. Lane Co., Oregon. DHW m2808
4a Dioicous; erect fertile shoots often reddish-tinged (but not rhizoids); flagellate branches frequent; oil bodies notably diverse, either 2-3 large, fusiform ones per cell (most common) or else more numerous, smaller ones; abundant on bare soil at low to middle elevations in Western Oregon
Solenostoma rubrum
4b Paroicous; shoot and rhizoids pale; flagellate branches uncommon; oil bodies various, usually 6-9 per cell; rare
Solenostoma confertissimum or Solenostoma sphaerocarpum