The Hepaticae and Anthocerotae of Brazil: Xylolejeunea X.-L. He & Grolle, Ann. Bot. Fenn. 38: 27. 2001.

By Xiaolan He. 2003

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World checklist of hornworts and liverworts (2016, background): “404 Riccardia hirtiflora is possibly conspecific with Riccardia emarginata (Gradstein and Costa 2003).”
Bryophytes diversity in Brazil (2015, background): “These figures are certainly close to the real diversity as they approach the estimates presented by Gradstein & Costa (2003) for liverworts and hornworts (600–750 species) and Costa et al. (2011) for mosses (892 species), with an addition of only three species over what was previously recorded by…”