Gymnomitrion obtusum
Marchantiophyta
Gymnomitrion obtusum (Gymnomitriaceae)
Blunt frostwort
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Frequent
Distinguishing Features
Thriving on vertical rock faces, G. obtusum presents itself in dense tufts of downtrending white, wormy shoots up to 1 mm wide by centimeter(s) long. With a hand lens you should be able to make out individual bilobed leaves tightly overlapping one another on all sides ("imbricate"). The tips of the lobes in this species are rounded, the lobes themselves joining about 1/3 down the length of the leaf in a sinus that is sharply-angled.
Similar species
See table
Habitat
Dry to moist, usually sheltered cliffs, rock faces, ledges, crevices, boulders, and soil (rare) in the lowland, montane, and subalpine zones
Associated species
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