Guide to Liverworts of Oregon: Key to Fossombronia 1

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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 > 29a rhizoids red, stems green > Fossombronia 1
1b plants leafy > 3b leaves not divided, not ciliate > 6a oil bodies 2+ or unknown > 7b no small dorsal lobe > 10a succubous > 11a anisophyllous > 12b leaves lobed > 37a rhizoids red, stems green > Fossombronia 1

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Left: Fossombronia pusilla, Goodman Creek, Lane Co., Oregon. DHW m1783. Right Fossombronia longiseta Monterey County, California. DHW m1219.

1a Capsule elevated well above involucre, seta 1 cm or longer when mature; spores with angled lamellae or spines; widespread at low elevations in western Oregon and California.
(COUPLET 2)

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Fossombronia foveolata Left: Scott Lake, Lane County, Oregon, DHW m3181. Right: Coos Co., Oregon, DHW m0797.

1b Seta short; capsule barely emergent from involucre; spores with a network of ridges and depressions (alveolate); coastal dune deflation plains and subalpine lake margins. (COUPLET 4)

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