Guide to Liverworts of Oregon: Key to Plagiochila
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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 entire > 28a underleaves inconspicuous > 29b if rhizoids red, stems red > 30a dorsal leaf margin recurved > Plagiochila
Porella porelloides - Left: Cherry Creek, Coos Co, Oregon. DHW 9047. Right: Cow Creek, Douglas Co., Oregon. DHW 7516.
1a Median leaf base cells occasionally elongated but distinct vitta lacking; margins sometimes dentate, marginal teeth shorter than distance between teeth; leaf surface dull to slightly glossy but not shiny; widespread in Oregon.
Plagiochila porelloides
Plagiochila semidecurrens - Queen Charlotte Islands, British Columbia, Canada. W.B. Schofield 15835.
2a Median leaf base with a distinct vitta (stripe) of elongated cells; margins spinous, marginal teeth longer than distance between teeth; leaf surface shiny, when dry appearing as if varnished; in Oregon known only from Saddle Mountain, Clatsop County.
Plagiochila semidecurrens