472 Morphologie. 



Der Inhalt der Schrift lässt sich kurz folgendermaassen charak- 

 terisiren : 



Aehnlichkeiten zwischen Pflanzen : 



a) im allgemeinen Habitus. 



b) in einzelnen Theilen (Sprosse, Blätter, Blüthen, Blüthen- 

 stände, Blütenteile, Früchte, Samen). 



Aehnlichkeiten zwischen Pflanzen und Thieren. 



Für zahlreiche der an Beispielen behandelten Aehnlich- 

 keiten werden Erklärungsversuche angegeben, welche mehr 

 oder weniger neu oder schon bekannt sind. Im Allgemeinen 

 strebt Verf. dem Ziel zu, nachzuweisen, dass die Anschauung, 

 als hätten Aehnlichkeiten zwischen Pflanzen, z. B. zwischen Taub- 

 nessel und Nessel die gleiche Bedeutung, wie die sog. Mimicry der 

 Thiere, die in der Regel gewisse Nutzeffecte erkennen lassen, un- 

 richtig ist. Was Verf. p. 25 behauptet, der Haarpelz vieler 

 alpiner oder arktischer Pflanzen sei ein Schutzmittel gegen die 

 Kälte, entspricht wohl nicht ganz der herrschenden Anschauung. 



Neger (Eisenach). 



Lloyd, V. E., An interesting irregulär ity in a rose 

 flower. (Torreya. II. 1902. p. 90—91.) 



Account of an abnormal rose bud in which one sepal was 

 inserted in the surface of the calyx cup. The writer considers 

 this as supporting the theory that the rose hip is a receptacle, 

 and not part of the calyx proper. d. H. Campbell. 



Sargent, Ethel, The Origin of the Seed-leaf in Mono- 

 cotyledons. (The New Phytologist. Vol. I. May, 1902. 

 No. 5. p. 107.) 



Some of the results ot the extensive researches of the 

 authoress upon the seedlings of Monocotyledons, especially 

 t hose of the Liliaceae, are summed up in this paper. In most 

 plants of this order the transition of the vascular arrangement 

 of the cotyledon and hypocotyl into that of the root is based 

 upon an asymmetric ground plan. It is shewn, however, that 

 this arrangement may be derived from the completely Sym- 

 metrie type discovered by the authoress in Anemarrhena 

 and Albuca, which she regards as the primitive form. 

 It is stated that the Symmetrie vascular bündle System of the 

 two fused cotyledons of the seedling of Eranthis passes over 

 into root strueture by a series of very similar transitions. In 

 reference to this fact the hypothesis is suggested that the mono- 

 cotyledon seedling is derived from specialized forms of an 

 ancestor with two cotyledons. D. T. Gwynne-Vaughan. 



Tansley, A. G., „Reduction" in Descent. (New Phyto- 

 logist. Vol. I. May, 1902. No. 6. p. 131.) 



A letter to the editor in which the comparison made by 

 Miss Sargent in the above paper between the seedlings of 

 Eranhtis and Anemarrhena is criticised. D. T. Gwynne-Vaughan. 



