Enviar este artículo por correo electrónico La filotaxis en Osmundales (Filices) fósiles
Resumen
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.
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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