Guide to Liverworts of Oregon: Key to Genera 31
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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 > 28a underleaves inconspicuous > 29b if rhizoids red, stems red > 30b leaf plane or evenly curved > 31
Jungermannia leiantha, showing bulging trigones; Modoc County, California, DHW m1443
31a Trigones bulging; bracteole absent; all bracts entire; perianth mouth lacking cilia although sometimes lobulate;
leaves almost never retuse; usually on soil, occasionally aquatic or on organic substrates; widespread
Jungermannia
Jamesoniella autumnalis - Left: Goodman Creek, Lane Co., Oregon, DHW m1635a. Right: TTMunger RNA, Skamania Co., Washington. DHW 7776.
31b Trigones concave; bracteole present; bases of female bracts lacerate; male bracts toothed or with a dorsal lobule; perianth mouth ciliate; a few leaves retuse,
not frequent but appearing regularly; underleaves present but usually minute; on decaying bark or
wood; mainly restricted to east side of the Cascades
Jamesoniella autumnalis