232 Morphologie etc. — Varietäten etc. 



Thatnnopteris with the petiolar bündle of Clepsydropsis\ through the 

 latter the comparison can be extended to traces of such various 

 forms as the Coenopteridean Metaclepsydopsis, Asterochlaetia, Anky- 

 ropteris anJ Diplolabis all of which pass through a Clepsydroid stage. 

 But whereas Kids ton and Gwynne-Vaughan seem to regard 

 this trace as phylogenetically mesarch, i.e. composed of centripetal 

 and centrifugal xylem, Dr. P. Bertrand appears to regard it as 

 having arisen by the adaxial completion of the outer centrifugal 

 xylem and describes these leaf-traces as composed of closed diver- 

 gents. The frequent adaxial completion of the outer xylem in Hei- 

 minthostachys certainly lends colour to this view and goes far to 

 justify the conception of the closed divergent as distinct from the 

 ordinary type of mesarchy. The two forms of apparent mesarchy 

 may be combined when the Clements of the inner centripetal xylem 

 persist into the region enclosed by the adaxial completion of the 

 outer (centrifugal) xylem, 



The author holds that the regulär presence of dormant axillary 

 apices in Botrychhini and Helminthost achys favours the view that 

 the primitive relation of the branches was to the leaves and that 

 the connection by forking with the main stem is a derivative con- 

 dition. Isabel M. P. Browne (University College London). 



Mägocsy-Dietz, S., Vorlage teratologischer Blüten der 

 Campamila rotnndifolia L. (Sitzungsber. bot. Sekt. kgl. Ung. na- 

 turw. Gesellsch. Mitt. f. d. Ausland. XV. iv. 1/2. p. (15)-(16). 1916.) 



Die Exemplare waren 15- bis 20-gliedrig. In den polymeren 

 Blüten bestand der Kelch, die Blumenkrone und das Androeceum 

 aus 15 — 20 Gliedern, nur der dicke Griffel endete in 3 Narbenäste, 

 die aber auch gespalten waren. Matouschek (Wien), 



Small, J., Anomalies in the Ovary of Senecio vulgaris L. 

 (Ann. Bot, XXX. p. 191, 192. 3 text tigs. 1916.) 



The author observed several cases of biovulate ovaries in Se- 

 necio vulgaris; in one of these cases a wall two cells thick extended 

 across the ovary which was thus bilocular, Numerous cases of 

 Single lateral ovules were observed. The author attributes some 

 phylogenetic value to these instances of displacement; in connexion 

 with the question of the relationship of the Calyceraceae and Com- 

 positae. Agnes Arber (Cambridge). 



Lotsy, J, P., Het tegenwoordige standpunt der Evolutie- 

 leer. (Martinus Nijhoff. 121 p. Den Haag, 1915.) 



Diese Schrift giebt den Inhalt eines Vortrages wieder den Verf. 

 in Mai 1915 zu Goes vor einem Vereine von Direktoren von „Rijks- 

 landbouwwinterscholen" hielt. Die Ansichten von Linne und 

 Jordan über Evolution werden besprochen, wobei zu beachten ist, 

 dass Verf. für die Linneschen Arten und die Jordanschen 

 elementaren Arten die Bezeichnungen „Linneonten" und „Jordanonten" 

 einführt, indem er als Arten nur die wirklich kleinsten Einheiten 

 mit grösstmöglicher Gleichheit der Individuen bezeichnen will. 



Es werden dann die Ansichten des Verf. denen von Lamarck, 

 Darwin und de Vries gegenübergestellt. Eine gedrängte Darstellung 

 der ersteren sei im folgenden angestrebt. 



