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mesarch

[ mez-ahrk, mes-, mee-zahrk, -sahrk ]

adjective

  1. Botany. (of a primary xylem or root) developing from both the periphery and the center; having the older cells surrounded by the younger cells.
  2. Ecology. (of a sere) originating in a mesic habitat.


mesarch

/ ˈmɛsɑːk /

adjective

  1. botany (of a xylem strand) having the first-formed xylem surrounded by that formed later, as in fern stems Compare exarch 2 endarch
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of mesarch1

First recorded in 1890–95; mes- + -arch
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Word History and Origins

Origin of mesarch1

C19: from mes ( o )- + Greek arkhē beginning
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Example Sentences

Similarly in the sporophylls of some cycads the bundles are endarch near the base and mesarch near the distal end of the stamen or carpel.

The mesarch structure of the leaf-bundles is met with in a less pronounced form in the flower peduncles of some cycads.

This fact is of importance as showing that the type of vascular structure, which characterized the stems of many Palaeozoic genera, has not entirely disappeared from the stems of modern cycads; but the mesarch bundle is now confined to the leaves and peduncles.

A point of anatomical interest is the occurrence in the vascular bundles of the cotyledons, scale-leaves, and elsewhere of a few centripetally developed tracheids, which give to the xylem-strands a mesarch structure such as characterizes the foliar bundles of cycads.

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mésallianceMesa Verde