BRIEFER ARTICLES. 



POLYEMBRYONY IN GINKGO. 



(with four figures) 



Polyembryony is common among the pines, but I have not seen it 

 recorded for Ginkgo. Recently in examining some material of Ginkgo, 

 collected in Washington, D. C, by Mr. R, F. 

 Griggs, the writer found a single case of poly- 

 embryony. The twin embryos were as complete 

 in every respect as the single embryos, except in 

 size. They measured lo""" in length, 

 which was about three-fourths the 

 average length of single embryos. 

 As is well known, the embryos are 

 dicotyledonous 

 in g e n er a 1 



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character, and when sectioned the cotyledons showed an elongation 

 of cells through the long axis, apparently the fibrovascular bundle. 

 The plumules were made up of several leaflets, a branch of the 

 fibrovascular bundle running into each; and near the surface sec- 



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[JULV 



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