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Phytochemical and morphological support for the existence of two species inMonoclea (Hepaticae)

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Recognition of two different species in the liverwort genusMonoclea Hook. (monotypic orderMonocleales), viz.M. forsteri Hook. in New Zealand andM. gottschei Lindb. in the New World, is supported by characteristics of the sporophyte, antheridial receptacle and secondary metabolites.M. gottschei produces the greatest variety of flavonoids and the largest amount of bisbibenzyls ever encountered in a liverwort. In contrast,M. forsteri is poor in secondary metabolites. Two allopatric subspecies are recognized inM. gottschei, based on characteristics of the antheridial receptacle: subsp.gottschei in Chile (Valdivian region, Juan Fernandez Is.) and subsp.elongata Gradst. & Mues, subsp. nova, in tropical America. The exclusive occurrence inMonoclea of glucuronide and galacturonide flavone glycosides and the fact that capsule dehiscence may take place before full elongation of the seta are new arguments in support of the placement ofMonocleales in theMarchantiidae.

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Publication Nr. 43 of the „Arbeitskreis Chemie und Biologie der Moose“, Universität des Saarlandes, Saarbrücken. This paper is dedicated to DrElla O. Campbell, Massey University, Department of Botany and Zoology, New Zealand on the occasion of her 80th birthday.

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Gradstein, S.R., Klein, R., Kraut, L. et al. Phytochemical and morphological support for the existence of two species inMonoclea (Hepaticae). Pl Syst Evol 180, 115–135 (1992). https://doi.org/10.1007/BF00940401

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Key words

  • Hepaticae
  • Monocleales
  • Monoclea
  • Chemotaxonomy
  • flavonoids
  • bisbibenzyls
  • terpenoids
  • morphology
  • sporophyte
  • antheridial receptacle
  • geographical variation