calyptrogenn.
/kəˈlɪptrədʒɛn/ Botany.
The outer zone or layer of the meristem or primary tissue of the youngest part of plants.
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meristem1872
plerome1875
protomeristem1880
calyptrogen1881
perimeristem1884
pleroma1890
promeristem1898
1881 Nature 27 Jan. 288/1 Four zones of meristem: calyptrogen, dermatogen, peroblem and plerome.
1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 9 Since this accession originates in certain cases from a special layer of meristem, the latter is to be distinguished as the calyptrogen.
This entry has not yet been fully updated (first published 1888; most recently modified version published online June 2018).
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