Jungermannia exsertifolia
| Common Name | None |
| Frequency | Locally Frequent |
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Distinguishing Features
A large, dark, unlobed leafy liverwort with an aquatic lifestyle, Jungermannia exsertifolia is a frequent presence on banks of subalpine and treeline drainage channels or flushes, where its long, lax shoots (up to 5cm or more) flutter in the current. The leaves are dark green to black and about as wide (up to 2 mm) as they are long. Rhizoids are pale brown or clear and underleaves are lacking. Antheridia and archegonia occur on separate plants (“dioicous”) and the perianth of leaves surrounding the developing archegonia is plicate near its apex.
Similar species
On account of its size and dark pallor, J. exsertifolia is unlikely to be mistaken for any other aquatic liverwort in its subalpine habitat. Species of Nardia and Chiloscyphus can be lax and aquatic in subalpine drainage, but they have underleaves that can be made out with a hand lens. Such underleaves are lacking in J. exsertifolia.
Habitat
Moist to wet rock outcrops, cliffs, ledges, crevices, boulders, bogs, streambanks, and waterfall spray zones, occasionally submerged in flowing water, in the lowland, montane, subalpine, and alpine zones
Associated species
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Distribution Map
Relevant Literature
- Godfrey, J.D. (1977). Hepaticae and Anthocerotae of southwestern British Columbia . [Doctoral dissertation, University of British Columbia]. UBC cIRcle.
- Hong, W. S. (2007). Scapania. In Flora of North America Editorial Committee (Eds.), Flora of North America North of Mexico (Vol. 3) . Oxford University Press.
- Wagner, D. H. (2013). Guide to the liverworts of Oregon: Scapania undulata . Oregon State University Herbarium.