Guide to Liverworts of Oregon: Jungermannia eucordifolia Schljakov
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Synonym: Jungermannia exsertifolia Steph. ssp.cordifolia (Dum.) Váňa
Special Status: None.
Recognition: Strictly aquatic or on rocks just out of water; leaves nearly horizontally inserted, rounded triangular; blackish green to dark green, often with reddish tinge; oil bodies few, 2-3 per cell, mostly globular (botryoidal but with smaller globules) to heterogeneous. If the specimens have been kept in the dark for a period of time, heterogenous oil bodies may become more homogeneously globular.
Distribution: On rocks in streams, from middle elevations to high elevations.
Comments: The leaf shape and large size distinguishes this from most other aquatic or amphibious species of Jungermannia s.l. The closest look alike is Jungermannia fusiformis which is also strictly aquatic and about the same size. The leaves of J. fusiformis are ovate, often wider than long, and have a border of slightly brown pigmented marginal cells.
The use of Jungermannia eucordifolia here is not recommended by Stotler and Crandall-Stotler (2017), who prefer the subspecies rank. Considering ssp.cordifolia is the only taxon in western north America and subsp. exsertifolia is restricted to eastern Asia, using this binomial seems to be both reasonable and convenient.
3 Sisters Wilderness, Lane Co., Oregon. DHW
m1769a
Linton Meadows, Lane Co., Oregon. DHW
s.n.
Marys Peak, Benton Co., Oregon. DHW
m1640
Sterile shoot; Parker Creek, Marys Peak, Benton Co., Oregon. DHW m2455.
Copyright 2006 Northwest Botanical Institute