Guide to Liverworts of Oregon: Key to Marsupella 4
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Marsupella 1a plants paroicous > Marsupella 2b oil bodies 2-3 per cell > Marsupella 3b dark green to reddish-brown > Marsupella 4
4a Perianth and perigynium distinct, no shoot calyptra; dark green to brownish-black; leaves spreading-suberect; leaf lobes acute to subacute.
Marsupella sprucei
Marsupella brevissima Shoot calyptra; Mt. Ashland, Jackson Co., Oregon. DHW 2573b.
4b Perianth vestigial, shoot calyptra distinct; reddish-brown; leaves erect-appressed; leaf-lobes obtuse to subacute.
Marsupella brevissima