Morel, G.Wetmore, R.H.2014-09-202014-09-201951-02American Journal of Botany, Vol.38, February 1951http://hdl.handle.net/123456789/5931It has been possible to obtain the proliferation in vitro of tissue of monocotyledons for potentially indefinite periods. Our studies seem to indicate that these tissues require certain growth substances, as yet undetermined, which are found in the milk of immature coconuts.enArticle