^ 



238 BOTANICAL GAZETTE ' [September 



prophase or telophase. The spindle is a cytoplasmic structure; even the part 

 within the limits of the nuclear membrane does not come from the network sur- 

 Tounding the nucleolus, but grows in from the outside. — Charles J. Chamberlain. 



Illinois River sand region.- — In connection with the work of the Illinois Bio- 

 logical Station on the Illinois River at Havana, a brief survey was made of 

 certain waste sandy areas in the neighborhood. The botanical survey was 

 made by H. A. Gleason/^ whose results have now been published. The ecologi- 

 cal factors of these peculiar areas are discussed, and four plant associations are 



,^r, iJ 



presented. Under prairie formation the three associations are the "bunch-grass, 

 the "blow-sand/' and the "blowout;" while the single representative of the 

 forest formation is the black-jack oak association. A list of the plants is given 

 and the phytogeographic relationships are discussed. — J. M. C. 



Sulfuric acid as a fungicide. — Kraemer'^'ih experimenting with dilute sul- 

 furic acid as a fungicide finds that solutions from i part to 500 to i part to 1000 

 are not injurious to ordinary field plants such as wild cherry, elder, ailanthus, 

 yellow dock, abutilon, and others. Roses infected with mildew were sprayed 

 several times with a solution of one part H2SO4 to 1000 water without injury 

 and with the complete destruction of the mildew. This fungicide may prove 

 especially useful in greenhouses where mildew is often very destructive to roses 

 and where ordinary fungicides are not applicable since they spot and discolor 

 the foliage. — H. Hasselbring. 



Chromosomes of Oenothera. — Geerts^^ finds 14 chromosomes in Oenothera 

 Lamarckiana. In connection with a brief pai)er he figures several somatic divisions 

 as well as the heterotypic mitosis in the microspore and megaspore mother 

 cells. Beer'^ found 14 chromosomes in O. longiflora and Gates^° reported 14 

 in O. lata, but 20 or more in the O. Lamarckiana hybrid obtained from a cross 

 of O. Lamarckiana with O. lata. Geerts also notes the constricted shape of 

 the chromosomes in the anaphase and telophase of mitosis. — R. R. Gates. 



Secondary thickening in Pandanus. — Schoute^^ has investigated the alleged 

 secondary growth in the stem of Pandanus, and comes to the same conclusion as 



+ 



botanical 



Lab 



17 Kraemer, Henry, Dilute sulphuric acid as a fungicide. Proc. Amer. Phil. 



Soc. 45:157-163. 1906. 



Zahl 



Ber. Dcutsch. Bot. Gesells. 25:191-195. pi, 6. 1907. 



^0 Beer, Rudolf, On the development of the pollen grain and anther of some 

 Onagraccae. Beih. Bot. Centralbl. 19:286-313. pis. j-5. 1905. 



20 Gates, R. R., Pollen development in hybrids of Oenothera lata X O. Lamarcki- 

 ana, and its relation to mutation. Box. Gazette 43:81-115. pis. 2-4, 1907- 



3' Schoute, J. C.: Ueber die Verdickungsweise des Stammes von Pandanus. 

 Ann. Jard. Bot. Buitenzorg II. 6:115-137. pis, §-8. 1907, 



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