Guide to Liverworts of Oregon: Key to Riccia 5
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Riccia 1b terrestrial > Riccia 2b marginal projections lacking > Riccia 5
Riccia cavernosa. Pine Creek, Modoc Co., California. DHW m1452a.
5a Upper layer of thallus spongiose, surface often lacunose.
(Couplet 6)
Riccia glauca. Goodman Creek, Lane Co., Oregon. DHW m1780.
5b Upper thallus layer dense, not spongiose, surface smooth, never lacunose.
(Couplet 7)