630 Morphologie etc. — Varietäten etc. 



le perigone; Taxe floral, portant ä la fois des frondes et des feuil- 

 les, tient du stipe et de la tige. P. Vuillemin. 



Winge, 0., Oogenesis hos Senecio (With an English Sum- 

 ma ry]. (Bot. Tidsskrift. XXXIII. p. 245-248. 10 textfig. 1913.) 



It is found that in Senecio vulgaris L. and in S. vulgaris var. 

 radiatus (the last named variety is shown to be constantly radiale 

 by self-fertilization) four megaspores are formed, the three inner of 

 which degenerate, the fourth (the embryosac) developing in a normal 

 way, obtaining eight nuclei and producing an embryo, as usually, 

 after fertilization, The nucleus in the three other megaspores always 

 divides in two, so that the degenerating megaspores are found 

 to be bi-nucleate during a long time. 



It seems peculiar to find something having resemblance to po- 

 lyspory in such a young genus as Senecio. 



0. Winge (Copenhagen). 



Worsdell, W. C, An Abnormal Shoot of Pinus Thunhergii 

 Pari. (New Phyt. XIV. 1. p. 23—26. 5 textfig. Jan. 1915.) 



On the abnormal shoot of Pinus Thunhergii Pari, described in 

 the present paper, a number of the ordinary 2-needled spur shoots 

 were replaced by a different kind of axillary shoot, which most 

 frequently took the form of a swoUen fleshy foliar organ arching 

 outwards over or againsl the subtending scaleleaf. It was determi- 

 ned that this recurved leaf is formed through the fusion, by their 

 adaxial margin, of the two transversely — placed leaves which 

 occur in so many of the axillary shoots, with which is incorporated, 

 at least in the basal region, one or two of the succeeding pairs of 

 leaves. The author regards this abnormality as indicating the existence 

 of a tendency in the Coniferae for the first two leaves of an axillary 

 shoot to unite by their adaxial margins to form a Single dominant 

 axillary foliar organ. It thus lends support to the prevailing view 

 of the morphological nature both of the ovuliferous Scale of the 

 Abietineae and of the "needle" of Sciadopitys. 



Agnes Arber (Cambridge). 



Bancroft, N., A Review of Literature concerning the Evo- 

 lution of Monocotyledons, (New Phyt. XIII. p. 285—308. 

 4 textfig. 1914.) 



This paper forms a very useful summary of the opinions which 

 have been held on this controversial subject. The views of Agardh, 

 Bessey, Wettstein and Lotsy are illustrated diagrammatically, 

 and the paper concludes with a bibliography of 78 titles. 



Agnes Arber (Cambridge). 



Burgeff, H., Untersuchungen über Variabilität, Sexualität 



und Erblichkeit bei Phycomyces nitens Kunze. (Flora. CVII. 



p. 259-315. 4 Tafeln 20 Abb. 1914.) 



Die Arbeit wurde ursprünglich in der Absicht unternommen 



durch äussere Einfiüsse Zwangsmutationen auszulösen. Beim genauen 



Studium des Ausgangsmaterials zeigte sich eine so grosse Variabilität 



