Without going into their reasons, Bold, Alexopoulos, & DelBevoryas (1980) and Crandall-Stotler (1980) believe that there are at least three independent lines of bryophytes and that this is best reflected by establishing three divisions - the Bryophyta (mosses), Hepatophyta (liverworts), and Anthocerotophyta (hornworts).
Source: wiktionary
2002, William R. Buck, Bryophytes, entry in Niles Eldredge (editor), Life on Earth, page 202,
Because of their small size and often delicate structure, bryophytes have a poor fossil record, dating back only about 290 million years.
Source: wiktionary
And so it was that I was introduced to Len Ellis and the quiet world of bryophytes – mosses to the rest of us.
Source: wiktionary