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
West end of Rooster Rock State Park, Multnomah Co., Oregon. N. Otting field photo, 16 October 2017. Note both red (male) and green (female) phenotypes. Also: Equisetum gametophyte (E. hyemale?) with young sporophytes.
6aa Air chambers barely open on upper surface; gray green to purplish red; dioicous; distal surface of spores vermiculate.
Riccia frostii
Riccia crystalina Frye & Clark 1937, p. 35.
6ab Upper surface smooth; blue green; monoicous; distal surface of spores reticulate.
Riccia crystallina