Duff, R.J.; Villarreal, J.C.; Cargill, D.C.; Renzaglia, K.S. 2007: Progress and challenges toward developing a phylogeny and classification of the hornworts. Bryologist 110(2): 214–243.
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| Duff, R.J.; Villarreal, J.C.; Cargill, D.C.; Renzaglia, K.S. 2007: Progress and challenges toward developing a phylogeny and classification of the hornworts. Bryologist 110(2): 214–243. |