Guide to Liverworts of Oregon: Key to Riccia 6
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Riccia 1b terrestrial > Riccia 2b marginal projections lacking > Riccia 5a surface spongiose > Riccia 6
Riccia cavernosa. Pine Creek, Modoc Co., California. DHW m1452a.
6a Upper surface strongly spongiose, air chambers open at surface; monoicous; distal surface of spores alveolate.
Riccia cavernosa
West end of Rooster Rock State Park, Multnomah Co., Oregon. N. Otting field photo, 16 October 2017. Note both red (male) and green (female) phenotype. Also: Equisetum gametophyte (E. hyemale?) with young sporophytes.
6b Upper surface smooth to moderately spongiose, air chambers small; dioicous or monoicous; distal surface of spores vermiculate or reticulate.
(Couplet 6a)