I. EMBRYO-SAC DEVELOPMENT AND EMBRYOLOGY . 



LIBRARY 



OF SYMPLOCARPUS FOETIDUS. NEW yor* 



botanicai 



C. Otto Rosendahl. Qakoen. 



In a preliminary note published in Science ^ the writer has called 

 attention briefly to some of the main features in the development 

 of the embryo of the common Skunk Cabbage {Symplocarpus 

 foetidus). The contemplated paper setting forth the facts more in 

 detail, was for various reasons unduly delayed, and in the meantime 

 a study of the "Morphology of Spathyema foetida" appeared in the 

 Botanical Gazette.- This paper dealt largely with the development 

 and structure of the micro- and macrosporangia, but did not take up 

 the development of the embryo beyond the 4-celled stage. Some of 

 the observations on the development of the embryo-sac recorded in 

 Mr. Gow's paper differ so markedly from those made by the writer 

 that it seems worth while to record them for comparison and in the 

 hope that further study of the subject may be stimulated thereby 



The material upon which these observations are made was col- 

 lected during the fall months from September to November until 

 the ground was frozen, and in the spring from the time the frost left 

 the ground until June. Various killing and fixing media were 

 used, of which chrom-acetic acid proved the best. Safranin-Gentian 

 Violet and Haidenhain's Iron Alum Haematoxylin gave the best 

 staining results. 



I wish to express my obligations to Dr. Harold L. Lyon and Mr. 

 W. H. Lippold, both lately connected with the Department of Bot- 

 any of the University of Minnesota, for suggestions and assistance 

 in the beginning of this work. I am also under obligation to Miss 

 Alice Misz for help in the tedious work of preparing the drawings 

 for the accompanying plates. 



^ A Preliminary Note on the Embryogeny of Symplocarpus foetidus. C. Otto 

 Rosendahl. Science. Vol. 23. April 13, 1906. p. 590. 



= Morphology of Spathyema foetida. James Ellis Gow. Botanical Gazette. Vol. 

 43, 2, p. 131. 1907. 



[1] 



