34 Botanisches Centralblatt. 



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an Kernmasse enthaltenden Zellen bei Zygnema. (Hedwigia. Band 



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 Guignard, L. 1904. La double fecondation chez les Malvacees. (Journ. 



de Bot. Ann. 18. No. 8 9. p. 296—308. 111.) 

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 Kuyper, H. P. 1904. Die Perithecium-Entwickelung von Monascus pur- 



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IV. Biologie. 



Cf. XV. Stahl. 



Freeman, E. M. 1904. Symbiosis in the genus Lolium. (Minnesota Bot. 



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 Harshberger. J. W. 1904. The relation of ice storms to trees. (Contrib. 



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