scale moss

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of various leafy liverworts of the order Jungermanniales.

GNU Webster's 1913

1. n. See Hepatica.
2. n. any leafy-stemmed moss of the order Hepaticæ; -- so called from the small imbricated scalelike leaves of most of the species. See Hepatica, 2, and Jungermannia.

WordNet 3.0

1. n. moss-like liverwort with tiny scalelike leaves; usually epiphytic