Bryophytes are primitive land-dwelling non-vascular plants comprising liverworts, hornworts, and mosses. Bryophytes [bryo- (moss) + -phyte (plant)] are non-vascular as they lack true vascular tissue (xylem and phloem). According to the traditional system of classification, all bryophytes belong to a single phylum or division “Bryophyta”. New classification (modern system of classification) categorizes bryophytes into three distinct phyla or divisions, viz. – Marchantiophyta / Hepaticophyta (liverworts), Anthocerotophyta (hornworts), and Bryophyta (mosses). Plant scientists (botanists) that specialize in the study of bryophytes (bryology) are called bryologists. Examples of bryophytes include Marchantia (a genus of liverworts), Anthoceros (a genus of hornworts), Sphagnum (a genus of mosses), Bryum (a genus of mosses), etc.