586 Morphologie und Teratologie. 



die Form des Blattrandes, etwas zuverlässiger ist die Art der 

 Nervatur, das sicherste liefert die Art des Ansatzes der Secundär- 

 nerven am primären Ast. Neger (Eisenach). 



CHURCH, A. H., Descriptive Morphology Phyllotaxis. 

 (The New Phytologist. Vol. 1. p. 49.) 



This paper gives a critical account of the various theories 

 of phyllotaxis. The author points out in his conclusion that 

 any morphological theory of spiral growth, includingspiral phyllo- 

 taxis, which is based on a proposition involving growth, should 

 be based on a logarithmic spiral on a plane surface, and not 

 on the spiral of Archimedes. W. H. Lang. 



COPELAND, E. B., Haberlandt's new Organ of Cono- 

 cephalus. (Bot. Gazette. XXXIII. 1902. p. 300—308.) 



The writer discusses the nature of the „Substitute hydathodes", 

 described by Haberlandt as occurring in Conocephalus 

 ovatus. Copeland denies that these are really new organs, 

 as claimed by Haberlandt, but Claims that they are merely 

 mistifications of cells brought about by pathological conditions. 

 Attention is called to the earlier experiments by Atkinson on 

 the artificial produetion of oedemata in tomatoes. The structures 

 occurring in Conocephalus are considered to be of the same 

 nature. D. H. Campbell. 



LYON, H. L., Observations on the embryogeny of 

 Nelumbo. (Minnesota Botanical Studies. II. 643—655. 1901. 

 3 pl.) 

 The paper comprises an introduction including a historical 

 summary. This is followed by sections treating of methods 

 used, and the results of the authors own researches ; a com- 

 parison of the embryogeny of Nelumbo wich that of Mono- 

 cotyledons, and a discussion of the systematic position of the 

 Nymphaeaceae. The author sums up his conclusions as follows: 

 1. Nelumbo both in its anatomy and embryogeny conforms to 

 the type of the Monocotyledons. 



2. The two fleshy bodies of the embryo arise through a 

 bifurcation of the originally Single cotyledons. 



3. The membrane surrounding the plumule is, as conjectured 

 by Wigand, a true endosperm arising within the embryo-sac. 



4. The family of the Nymphaeaceae should be placed among 

 Monocotyledons in the series Helobieae. D. H. Campbell. 



Thisleton-Dyer, Sir W. T., Morphological not es. VII. 

 Evolution of Pitchers in Dischidia rafflesiana. (Annais 

 of Botany. Vol. XVI. 1902. p. 365.) 



The author discusses the views held on the morphology 

 and the teleological object of the pitchers of Dischidia. Inter- 

 mediate forms between the normal leaves and the perfect pitchers 



