Morphologie etc. — Physiologie. 661 



Chromosomengestalt wird bei der Nachwirkung nach dem Chlorali- 

 sieren stark verändert. Die Chromosomen werden viel kürzer als 

 normal. Bei der 3 Tage fortdauernden Nachwirkung finden auch 

 abnorme Mitosen statt, die darauf beruhen, dass die plasmatischen 

 Teilungsfunktionen gelähmt sind, dagegen nicht die Teilungser- 

 scheinungen der Chromosomen. Dabei werden abnorme (nicht 

 x-ploide) Zahlen veranlasst. Die Teilungsgeschwindigkeit der di- 

 ploiden Zellen ist grösser wie diejenigen der didiploiden Zellen. 

 Nemec's Befunde über eine autoregulative Reduktion der Chromo- 

 somenzahl in didiploiden Zellen wird nicht bestätigt. 



Matouschek (Wien). 



Martin, J. N., Comparative Morphology of so me L^^ww?- 

 nosae. (The Botan. Gazette. LVIII. p. 154—167. PI. VIII— XI. 1914.) 



This investigation Covers the development of the embryo sac, 

 embryo and endosperm of Trifolium pratense, T. hybridunt, T. re- 

 pens, Meäicago sativn and Vicia americana. Each species is described 

 for itself. At the end of the paper a dJscussion of the results of 

 this investigation and of that of other authors is given, followed by 

 a summary, in which are mentioned the features common to the 5 

 species and those, in which they are different. 



Features common to the 5 species are as follows: 1 campyio- 

 tropous ovules; 2 two integuments, the outer preceding the inner; 

 3 a multicellular archesporium; 4 one parietal cell cut off, which 

 gives rise to more or less parietal tissue; 5 the production of a row 

 of 4 megaspores; 6 the rapid destruction of nucellar tissue, which 

 brings the embryo sac in contact with the inner integument; 7 an- 

 tipodals ephemeral. 



Contrasting features are as follows: 1 The number of ovules 

 is always 2 in Trifolium pratense, but more than 1 and various in 

 the other species. 2. The third megaspore sometimes functions in 

 T. repens. 3. In Trifolium the embryo sac rapidly destroys the anti- 

 podal end of the nucellus and thus forms a long tubulär sac. 4 In 

 Trifolium the embryo sac remains very vacuolate, while in Vicia 

 and Medicago the sac fiUs with cytoplasm. 5. Polars meet on median 

 line or on inner side of sac in Trifolium, but rest near the egg 

 apparatus; in Medicago the polars meet near the center of the sac 

 and rest near the egg apparatus; while in Vicia they meet on the 

 inner side of the sac and remain some distance from the egii, ap- 

 paratus. 6. In Trifolium and Vicia, the starch appears in the micro- 

 pylar end of the nucellus and in the inner integument, while the 

 starch fills the sac in Medicago. 7. In Trifolium the proembryo is 

 Short and massive and no definite line between suspensor and 

 embryo was made out; more evidence of the separate parts was 

 Seen in the more slender proembryos of T. hybridum and T. repens. 

 8. Definite suspensors with multinucleate cells appear in Medicago 

 sativa and Vicia americana\ in the former species the suspensor is 

 filamentous, but composed of 2 superimposed pairs of cells in the 

 latter species. 9. Sterilization ist most marked in T. pratense. 



Jongmans. 



Bro-wn, W. H., The phenomenon offatigue in thestigma 

 of Martynia. (Philippine Journ. Sei. C. Bot. VIII. p. 197— 201. 1913.) 



Experimental studies upon the closing response and subsequent 

 opening of the Stigma lips of Martynia proboscidia, with a demon- 



