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Musaceae.
Pollen development in this family has been extensively studied by
TiscHLER and D’ANGREMOND on different forms of Musa. My own
investigation of
Heliconia Bihai L.
has, too, shown successiv bipartition. Further, the same variations
in arrangement and number of the cells of the ready tetrad, as
described and figured by D’ANGREMOND for Musa, occur in Heliconia.
Zingiberaceae.
The obvious relationship of Zingiberaceae to the Musaceae is em-
phasized by the close ressemblance in the pollen formation of both
families. The species, investigated by myself,
Costus cylindricus Jac. and
Curcuma colorata Val.
are thus characterized by successiv bipartition. The partition walls
are here laid down in the same irregular way as in Musa; as there,
the number of microspores, formed in one mother cell, ranges from
four to seven, belated chromosomes or groups of chromosomes
having given rise to the supernumerary spores.
Orchidaceae.
In the orchid family quadripartition has since long ago been
known. As found by the author, in
Phalaenopsis amabilis
the succession of events agrees in all respects with the account
given by GUIGNARD.
Palmae.
Recently SÖDERBERG has found simultanous quadriparlition in the
palm Chamaedorea corallina. To this exemple I am now in a po-
sition to add the following ones:
Areca triandra Roxb.,
Carysta spec.,
Pterygospermum spec.
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