Morphologie etc. — Varietäten etc. 403 



dann erst anfangen sich zu verzweigen (z. B. Hevea, Cordia, Ceiba, 

 Cecropia, Bomhax, Virola, Schisolobium). Als Rutenbäume bezeichnet 

 der Verf. solche Bäume, die auf einem langen, dünnen Stamm 

 eine kleine, aber immerhin verzweigte Krone tragen. Die auffal- 

 lendste Erscheinung sind jedenfalls die dicotylen Schopfbäume, die 

 ganz den Habitus von Palmen haben. Als ein sehr schönes Beispiel 

 beschreibt und bildet der Verf. ab die Rutacee Sohnregia excelsa. 

 Eigentümlich etagenf örmige Kronenbildung zeigt eine Theobromaart. 



Neger. 



West, C. and A. E. Lechmere. On Chromatin Extension in 

 Pollen Mother-cells of Lilium candidum, Linn. (Ann. Bot. 

 XXIX. p. 285—291. 1 pl. April 1915.) 



Chromatin extension, from pollen mother-cell nuclei into the 

 cytoplasm of adjacent cells, has been recorded by several obser- 

 vers, but it has not hitherto been observed in Z//zwm, although this 

 genus has been the subject of much cytological investigation. The 

 authors draw attention to the occurrence of this process during the 

 synaptic and „hollow spireme" stages. The nucleolus takes no part 

 in the extension. The authors regard this phenomenon as a normal 

 condition of meiosis, the extension of nuclear material (i e. waste 

 products) being attributed to the active m'etabolism of the nucleus 

 during the meiotic phase. Agnes Arber (Cambridge). 



Chittenden, F. J., The Rogue Wall fl owe r. Contributions 

 from the Wisley Laboratory. XXII. (Journ. Roy. Hort. 

 Soc. XL. Part 1. p. 83—87. 1914.) 



The „rogue" form among wallflowers has long been known 

 and was named Cheiranthiis Cheiri y gynantherus by A. P. de Can- 

 dolle. In the malformation both petals and stamens are involved, 

 the flower being reduced to oblong coloured leaves about as long, 

 or slighthy shorther than the sepals, while the stamens are con- 

 verted into carpels. It is possible that the plants may be hybrids 

 in the Mendelian sense and carry the characters of both normal 

 and rogue forms, but, on the other band there is no evidence to 

 Show that the „rogues" do not arise as seminal Sports. An experi- 

 ment was carried out wherein rogue plants were poUinated. Both 

 central and supplementary carpels set seed, which was sown, — 

 the resulting plants being normal. The seed from these plants was 

 again raised and from the proportion of the normal type and rogue 

 type obtained it, may be assumed that simple Mendelian segrega- 

 tion is taking place. E. M. Jesson (Kew). 



Godfrey, M. J., A new hybrid Ophrys. (Journ. Bot. LIII. N» 629. 

 ■ p. 121. May 1915.) 



Ophrys X Kelleri, Godfrey hybr. nov. is described (0. arachni- 

 tiformis Gren. & Phil. X ^- atrata). The plant was found among a 

 small colony of O. arachnitiformis , at Hyferes. O. atrata was also 

 frequent in the neighbourhood. E. M. Jesson (Kew). 



Harris, J. A., Supplementary studies on the differential 

 mortality with respect to seed weight in the germi- 



