Guide to Liverworts of Oregon: Key to Bazzania 2
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1b plants leafy > 3b leaves not divided, not ciliate > 6a oil bodies 2+ or unknown > 7b no small dorsal lobe > 10b leaves incubous > 20b lobule absent > 23b lobule absent > 24b leaves 2-3 dentate > Bazzania 1b caducous leaves present
Bazzania ambigua, Cedar River Co., Washington. DHW m1979
2a Oil bodies 2-4(5) per median cell, spherical to fusiform, 5-8(13)mm, clear, lumpy but not strictly homogeneous or glistening; leaf apices somewhat variable, but predominantly bidentate with a shallow, lunate sinus
Bazzania ambigua
Klaloch, Jefferson Co., Washington. DHW m1104b.
2b Oil bodies 8-12 per cell, fusiform to (occasionally) spherical, the larger 10-12mm long,
clear, homogeneous or partly (indistinctly) segmented, glistening; leaf apices very variable, from merely acute to tridentate but without one type predominating, rarely a majority bidentate
Bazzania denudata