Guide to Liverworts of Oregon: Key to Genera 64
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1a plants thallose > 2b chloroplasts numerous > 62a thallus tissue homogeneous > 63a mounds or short bifurcations > 64
Sphaerocarpos texanus, Lane Co., Oregon. DHW m1511a
64a Flask shaped involucres conspicuous, individually sheathing antheridia or archegonia (plants
dioicous), sessile, crowded on the upper surface of thallus
Sphaerocarpos
Riccia sorocarpa. Left: Lane Co., Oregon; right: Ferris Gulch, Jackson Co., Oregon, DHW 9186.
64b Involucres lacking; archegonia, antheridia, and capsules embedded in the thallus
Riccia