212 Cytologie und Befruchtung. 



relatively small, but the integuments and base of the ovule 

 are very massive, and compress the greater part of the seed. 



6. In Spathicarpa the development of the ovule and embryo- 

 sac are of the usual type. After fertilisation the antipodals 

 become very greatly enlarged, and one of them inay divide, 

 so that there are often four antipodals present. The nuclei of 

 the antipodal cells become enormously enlarged. 



7. The embryo of Spathicarpa remains small in the ripe 

 seed. The external organs are indicated, but the tissues remain 

 but slightly developed. 



8. The development of the endosperm in both Aglaonema 

 and Spathicarpa proceeds gradually from the base of the sac 

 until it is completely filled. It is probable that this is the 

 ordinary method of endosperm-formation in the Araceae. 



W. H. Lang. 



HOLFERTY, C. M., The Archegonium of Mnlum cuspidatum. 

 (Botanical Gazette. 37. 1904. p. 106—126.) 



From an investigation of the archegonium in this species, 

 the author reaches the conclusion that the archegonium and 

 antheridium are homologous organs and have both been derived 

 from the gametangium of an extinct phylum of the Chlor o- 

 physeae by the sterilization of peripheral potentialiy zoospore- 

 producing cells. He points out that both antheridium and arche- 

 gonium originate from papillär cells of the receptacle and that 

 their mode of growth is for a time by the segmentation of an 

 apical two sided cell. In the archegonium this mode of 

 growth subsequently gives place to that by segmentation of a 

 three sided apical initial, when the axial row is formed. 

 Archegonia show further evidence of their homology with an- 

 theridia by the fact that not infrequently cells of their axial 

 row actually break up into small spermatocytoid cells. 



E. C. Jeffrey. 



LLOYD, FRANCIS E v Vivipary in Podocarpus. (Torreya. IL 

 Aug. 1903. No. 8.) 



The writer observed vivipary in P. Makoyl growing in the 

 conservatories of the New York Botanical Garden. The anatro- 

 pous seed of this species, incompletely covered by the aril, 

 germinates on the tree, sending forth a generally curved hypo- 

 cotyl terminated by avery abbreviated radicular region. The 

 primary root generally withers away so that when the seed 

 finally falls, the seedling becomes attached by secondary roots 

 growing out from the base of the hypocotyl. e. C. Jeffrey. 



ROSENBERG, 0., Ueber dieReduktionstheilung in Drosera. 

 i'Meddelande fr. Stockholms Högskolas Botan. Institut. Stock- 

 holm 1904. Mit Figuren im Texte.) 



Verf. hat schon in zwei früheren Mitteilungen (Ber. deutsch. 

 Bot. Ges. 1904) dieselbe Frage gestreift, indem er bei einem 



