Guide to Liverworts of Oregon: Key to Riccia 8
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Riccia 1b terrestrial > Riccia 2b marginal projections lacking > Riccia 5b surface smooth > Riccia 7b upper surface groove shallow > Riccia 8
Riccia nigrella. Ferris Gulch, Jackson County, Oregon. DHW 9134.
8a Ventral scales black, conspicuous.
Riccia nigrella
Riccia campbelliana. Wagontire Rock, Monterey Co., California. DHW m1235b.
8b Ventral scales pale, inconspicuous.
(Couplet 9)