Guide to Liverworts of Oregon: Key to Riccardia 1
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1a plants thallose > 2b chloroplasts numerous > 62a thallus tissue homogeneous > 63b thallus ribbon like > 65b ventral scales absent > 66b thallus without hairs > 67a sex organs on branches > 68 thallus 1-2 mm wide > Riccardia 1
Thallus cells, McDowell Creek, Linn County, Oregon. DHW m271X.
1a Oil bodies absent from all cells; monoicous
Riccardia latifrons
Riccardia multifida, Yaquina Head, Licoln County, Oregon. DHW m2243.
1b Oil bodies present in many cells (these granular, brownish, and mostly solitary or few per cell); sexuality various
(Couplet 2)