Guide to Liverworts of Oregon: Key to Genera 33
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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 > 28b underleaves conspicuous > 32a underleaves bifid > 33
South Slough, Coos County, Oregon. DHW m2428a.
33a Underleaves with straight, entire, parallel sides, the two acuminate lobes pointing straight
forward; rhizoids densely clustered around raised red pads on ventral stem surface between the
underleaves, usually completely obscuring stem and underleaves behind the youngest few leaves; pioneer on recently disturbed bare soil; abundant near coast, occasional inland, W of Cascades
Gyrothyra underwoodiana
Chiloscyphus polyanthus, bifid underleaves; left: Jefferson County, Oregon, DHW m1344; right: Modoc County, California, DHW m1443b
33b Underleaves more or less rounded on sides, bearing lateral lobes or cilia; the underleaf lobes often divergent; rhizoids in tufts at base of underleaves, exposing stem between rhizoid tufts and underleaves even in older parts of stem; on stable substrates; widespread across the state.
Chiloscyphus