La filotaxis en Osmundales (Filices) fósiles

Rafael Herbst


The phyllotaxis of the fossil Osmundales (Filices). An analysis of fossil and recent stems of
Osmundales is carried out to establish their phyllotaxis. A practical method proposed by Erasmus is used and
thus examples of at least 8 genera and 32 species, based mainly on specimens depicted in the literature, are
given. It may be concluded that in this group of ferns only phyllotactical conditions of 5/13, 8/21, 13/34, 21/55
and 34/89 are present with a clear dominance of those of 13/34 and 21/55 in fossils while extant species only
show 8/21 phyllotaxis.

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