Guide to Liverworts of Oregon: Key to Genera 28
1b plants leafy > 3b leaves not divided, not ciliate > 6a oil bodies 2+ or unknown > 7b no small dorsal lobe > 10a succubous > 11a anisophyllous > 12a leaves unlobed > 28
Jungermannia polaris, Baker Co., Oregon. DHW 8217. Note the absence of underleaves on the underside of the stem whence the rhizoids grow.
28a Underleaves absent or minute; if present, usually reduced to tiny, few-celled projections.
Left: Gyrothyra underwoodiana, VENTRAL VIEW!; right: Nardia scalaris, Jefferson Co., Washington. DHW m1116.
28b Underleaves regularly produced and relatively distinct, usually easily found at least at tips of sterile shoots (known as "conspicuous" to experienced hepaticologists);however, sometimes difficult to find because in some specimens they may soon be eroded or lost among rhizoids.
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