The Collaborative International Dictionary
Bryology
Bryology \Bry*ol"o*gy\, n. [Gr. ? moss + -logy.] That part of botany which relates to mosses.
Wiktionary
bryology
n. (context botany English) The study of bryophytes (non-vascular plants including mosses and liverworts).
Wikipedia
Bryology
Bryology (from Greek bryon, a moss, a liverwort) is the branch of botany concerned with the scientific study of bryophytes ( mosses, liverworts, and hornworts). Bryologists are people who have an active interest in observing, recording, classifying or researching bryophytes.