596 Morphologie, Teratologie, Befruchtung, C3^tologie. 



rings may sometimes be seen actualy linked together, then forming 

 Short chains or Clusters of rings. An exploration of the group of 

 linked rings seems to require their origin from an involved tangle 

 of loops, united at certain points, which finally segment in such a 

 manner that the fused loops (new rings) are linked together. In the 

 heterotypic mitosis these rings break into half rings, each of which 

 represents a sporophytic chromosome. 



The author points out that he has, on theoretical grounds, been 

 strongly inclined towards the view of the reduction division held 

 by Allen, Gregoire, Overton and Rosenberg. But the pre- 

 sent study of Oenothera grandiflora presents conditions which he 

 cannot bring into harmony with their conclusions, and which seem 

 to require the explanation of chromosome association advanced by 

 Farmer and Moore. Agnes Arber (Cambridge). 



Evans, W. E., On the further Development during Ger- 

 mination of Monocotylous Embryos; with special Re- 

 ference to their Plumular Meristem. (Notes from rov. Bot. 

 Gard. Edinburgh XXI. p. 1—20. 2 pl. and textfigs. 1909.) 



The author points out that although the germination of seeds 

 has been b}^ no means a neglected subject, many of the problems 

 connected with it remain almost untouched. For instance we know 

 little of the effects produced by differences of environment at the 

 time of germination. Another question which still remains open is 

 whether the leaf is essentially a lateral outgrowth from the stem, 

 or originally a terminal organ. 



The author intends to deal in succession with a number of types 

 of monocotyledonous seedlings, the examples forming a series ran- 

 ging from cases in which the leaves always appear lateral, to cases 

 of apparent extreme stem suppression. The account of each example 

 will be complete in itself, and will include a bibliography relating 

 to the plant under discussion. There will be a final chapter reviewing 

 the whole subject and drawing conclusions. The present instalment 

 gives a fully illustrated account of germination in the genus Aspa- 

 ragus and other Asparageae. Agnes Arber (Cambridge). 



Loew, E., Der Sprossaufbau und die damit zusammen- 

 hängenden Lebenseinrichtungen von Allium Victoriaiis 

 L. (Verh. bot. Ver. Prov. Brandenburg. L. 1908. [ersch. 1909.] p. 

 1-16. 24. Abb.) 



Loew, E., Der Sprossaufbau und die damit zusammen- 

 hängenden Lebenseinrichtungen der mitteleuropischen 

 Allium- Arten. (Ibid. p. 52—68. 29 Abb.) 



Der Aufbau des Verjüngungssprosses von Allium Victoriaiis 

 steht in enger Beziehung zu den Lebensverhältnissen der Pflanze, 

 die als Hochgebirgsbewohnerin von anderen etwa in Steppengebieten 

 mit langer Trockenperiode einheimischen Allium-Arten oekologisch 

 wesentlich abweicht. Eigentliche Speicherblätter werden von A. 

 Victoriaiis überhaupt nicht gebildet. Die sonst zu Speicherorganen 

 entwickelten Niederblätter bilden nur die Schützhülle für das dar- 

 unter geborgene junge Laub und für die von der Spatha noch weiter 

 geschützte Inflorescenz. Als Ablagerungsstelle für die Reservestoffe 

 dient wesentlich nur die Grundachse, die hier daher ein mächtiges 

 Langen- und Dickenwachstum besitzt und mehrere Jahre, mindestens 



