perimeristemn.
/ˌpɛrɪˈmɛrᵻstɛm/, U.S. /ˌpɛrəˈmɛrəˌstɛm/ Botany. rare.
The outermost layer of an apical meristem, which develops into the outer cortex and dermatogen. Cf. mesomeristem n.
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the world > plants > part of plant > cell or aggregate tissue > [noun] > tissue > meristem
meristem1872
plerome1875
protomeristem1880
calyptrogen1881
perimeristem1884
pleroma1890
promeristem1898
1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 394 Russow maintains essentially the same view, calling Sanio's primary pith Endomeristem, the zone surrounding it Exomeristem; the latter is divided into the Mesomeristem, which is the inner layer producing the vascular bundles, and the Perimeristem, which is the outer zone, forming the external cortex and the Dermatogen. Endistem, Existem, Mesistem, and Peristem are abbreviated expressions for these successive layers.
1976 Amer. Jrnl. Bot. 63 115 The inner and outer medullary tissues are derived from the base and sides of the perimeristem region surrounding the apical cell, while the cortical tissues are derived primarily from the upper perimeristem region and subepidermal layers of the apex.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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