265 



Musaceae. 



Pollen (levelopment in Ihis faniily has heen extensively studied by 

 Tisciii.KK and i)'Angiu:mom) on dillerenl forms of Musa. My own 

 invesligation of 



Helicnnia Bihai L. 

 has, too, shown successiv biparlilion. Furlher, Ihe same variations 

 in arrangenient and numher of the cells of Ihe ready teträd, as 

 described and figured by i)'Anoi?kmonu for Miisd, occur in Ileliconia. 



Zingiberaceae. 



The obvious relalionship 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 cijlindricus Jac. and 



Curcuma colorata Val. 

 are Ihus characterized by successiv bipartition. The partition walls 

 are here laid down in the same irregular ^vay as in Masa; as there, 

 the number of microspores, formed in one molher cell, ranges from 

 four to seven, belaled chromosomes or groups of chromosomes 

 having given rise to the supernumerary spores. 



Orchidaceae. 



In the orchid family (juadripartition bas since long ago been 

 known. As found l)y the aulbor, in 



Phalaenopsis amabilis 

 the succession of events agrees in all respccts ^vilh the account 

 given by Glignahd. 



Palmae. 



Recently Söderberg has found simultanous (juadriparlition in the 

 palm Chamaedorea corallina. To this exemple I ani now in a po- 

 sition to add the following ones: 



Areca triandra Roxb., 



Canjsta spec, 



Pterijgospermum spec. 



