358 Morphologie etc. — Varietäten, Descendenz, Hybriden. 



Yamanouchi, S., Chromosomes in Osmunda. (Bot. Gaz. IL. 

 p. 1-12, PL 1. 1910.) 



The reticulum of the young nucleus arises through the vacuo- 

 lation of the chromosomes of the previous mitosis and shows no 

 indication of a pairing of knots or Strands. The individuality of the 

 chromosomes is maintained in the resting condition, although this 

 is not easy to demonstrate. Pairing of chromatin material, perhaps 

 of paternal and maternal origin occurs at synapsis and the associa- 

 tion is very close but the duality is always maintained and there is 

 no actual fusion. In the heterotypic mitosis there is no Splitting of 

 chromosomes, the bivalent chromosome being formed by the asso- 

 ciation of two independent chromosomes which separate and thus 

 give the appearance of a longitudinal Splitting. The tigures are 

 remarkably clear and well drawn. 



Charles J. Chamberlain (Chicago). 



Yamanouchi, S., Cytology of Cutleria and Aglaosonia. (Bot. Gaz. 

 XLVIII. p. 380-386. 1909.) 



A preliminary study of material collected at Naples shows the 

 foUowing results: The nucleus in both male and female plants of 

 Cutleria multifida shows 24 chromosomes and the sporelings formed 

 by the union of gametes and which develop into the Aglaosonia 

 stage, have 48 chromosomes. The Aglaosonia form therefore repre- 

 sents the sporophytic and the Cutleria form the gametophytic stage 

 of this plant. 



Aglaosonia reptans contains 48 chromosomes and the number 

 is reduced to 24 during zoospore formation. The zoospores, with 

 the reduced number of chromosomes, germinate without conjugation 

 and, under culture, develop into plants identical with Cutleria mul- 

 tifida at is occurs in nature. Charles J. Chamberlain (Chicago). 



Fleischmann, H., Ein neuer Orchideenbastard: Spiranthes 

 aestivalis X autumnalis. (Oesterr. bot. Zeitschr. LX. 12. p. 449— 451. 

 1910.) 

 Verf. nennt den Bastard, den er längs eines Torfmoores bei 

 Hoch filzen in Tirol 970 m. s. m. fand, Spiranthes Zahlbruckneri 

 und beschreibt ihn lateinisch. Von Sp. aestivalis Rieh, unterscheidet 

 er sich durch die fast einzeilige Aere, gröbere Behaarung, grau- 

 grüne Färbung des Stengels und Fruchtknotens, die in der Mitte 

 grünliche Lippe, kleinere ^Blüten, kugeliger Höcker am Grunde der 

 Lippe, Fehlen der stengelständigen Laubblätter, die dem Boden 

 mehrangedrückte Blattrosette und durch kräftigere, mehr auseinan- 

 der strebende Knollen. Von Sp. autumnalis Rieh, unterscheidet er 

 sich durch grössere Blüten, hellere Farbe des Stengels und Frucht- 

 knotens, längere Blätter, welche zur Blütezeit noch lebhaft grün 

 und fleischig sind, durch das Fehlen der fürs nächste Jahr bestimm- 

 ten jungen Blattrosette seitlich des heurigen Stengels und durch die 

 frühere Blütezeit. Matouschek (Wien). 



Howard, A., L. C. Gabrielle, and Abdur Rahman Khan. The 



Economic Significance of Natural Cross-Fertilization in 

 India. (Mem. Depart. Agrie. in India, Bot. Series III. N». 6. 49 pp. pls. 

 1910.) 

 Class I. Crops with closed flowers, such as cereals and pulses 



