Guide to Liverworts of Oregon: Key to Calypogeia 3
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Calypogeia 1b oil bodies colorless > Calypogeia 2a underleaves bifid > Calypogeia 3
3a Large plants, shoots generally 2.0 - 3.75 mm wide; oil bodies usually with a grayish cast,
composed of numerous granules; lobes of underleaves usually rounded
Calypogeia muelleriana
3b Smaller plants, shoots less than 2 mm wide; oil bodies clear, mostly composed of a few large globules, some unsegmented oil bodies always present; lobes of underleaves typically obtuse to acute
(Couplet 4)