104 Biologie. — Descendenz u. Hybriden. — Morphologie. 



head is again erect ; in Jiisticia anagalloides, T. And. the lower, barren 

 anther seems to act as a trigger ; Harveya Randii Hiern n. sp. has 

 bright conspicuous flowers and is parasitic on a small mos-like Com- 

 posite; the lower barren half of the anther is very large. 



In the further portion of the paper the pollination mechanism of a 

 number of South African Asclepiadeae (Raphionacme divaricata 

 Hans., R. Galplni Schlecht, etc ) is discussed. Sisyranthiis Randii, S. 

 Moore n. sp. is also described; the corolla is shortly campanulate, the 

 pollinia are attached by one end directly to the corpusculum^ the free 

 end having a projecting vving or keel. F. E. Fritsch. 



Gross, E., Zur Konstanz der Roggen-Varietäten. 



(Naturwissenschaftliche Zeitschrift für Land- und Forstwirth- 



schaft. I. 1903. Heft IV.) 



Westermeier hat (Bot. Centralbl. 1899) die Ansicht aus- 

 sprechen, dass ein deutlicher Einfluss der Fremdbestäubung bei 

 Nebeneinanderbau verschiedener Roggensorten nicht wahrzu- 

 nehmen ist, und dass bei Roggen überwiegend die Eigen- 

 schaften der Mutterpflanze vererbt werden. Der Verf. unter- 

 suchte in drei Jahren das Verhalten einiger werthbildender 

 Eigenschaften von drei nebeneinander gebauten Sorten und 

 fand auch keinerlei Annäherung der Sorten aneinander, mit 

 Beziehung auf diese Eigenschaften. Bei starker Wirkung der 

 Bastardirung zwischen den Sorten hätten sich dieselben in dem 



Ausmaass der Eigenschaften einander nähern müssen. 



Fruwirth. 



Morgan T. H., The H y p o t h e s i s o f F o r m a t i v e S t u f f s. 



(Bull. Torrev Bot. Club. Vol. XXX. April 1903. p. 206 



—213.) 



A discussion of the hypothesis of formative stuffs as advanced 

 by Goebel, in which the author questions this point of view. 

 While admitting that under certain circum.stances the presence 

 of formative stuffs may play a part in regenerative processes, 

 is inclined to doubt that they can be the chief factors in cases 

 where polarity is involved. Is especially inclined to contest the 

 idea that the presence of mobile stuffs can explain this phenomenon 

 of polarity. Thinks the real cause of the flow of the formation 

 materiai to lie in the presence of certain organs, where the 

 substances concerned are being in some way utilized. In 

 Support of the view that the phenomenon of regeneration 

 can not be explained by a purely chemical hypothesis, but is 

 dependent upon certain physical conditions also, cites parti- 

 cularly the case of a tubularian hydroid Tuhiilaria 

 Mesembryanthemiim. When a long piece of the stem of the 

 tubularia is cut off the distal end develops a new head or 

 hydranth twenty-four hours in advance of a similar development 

 on the part of the proximal end. This delay in the appearance 

 of the proximal head not explained by the stuff-hypothesis, be- 

 cause; 1. If a thread is tied around the piece the distal head 

 develops as usual and the proximal head more quickly; 2. If a 



