Guide to Liverworts of Oregon: Key to Ptilidium 2
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1b plants leafy > 3a leaves divided 1/2 or more > 4a lobe base laminar > Ptilidium 1 lobe tips not attenuate > Ptilidium 2
From Frye and Clark 1937-1947, V. 6 p. 200.
2a Base of largest leaf lobe 6-11 cells wide; longest cilia on margins longer than width of base of largest leaf lobe; rare in the West, reported once from NE Oregon.
Ptilidium pulcherrimum
Ptilidium ciliare, Kenai Penin., Alaska. E. Berg s.n.
2b Base of largest leaf lobe 14-25 cells wide; marginal cilia shorter than largest leaf lobe base; not yet found in Oregon, becoming more frequent in the North Cascades of Washington and northward.
Ptilidium ciliare
Copyright 2006 Northwest Botanical Institute