leptomen.
/ˈlɛptəʊm/ Botany.
(See quot. 1965.)
ΘΚΠ
the world > plants > part of plant > cell or aggregate tissue > [noun] > tissue > xylem or phloem
liber1753
phloem1872
xylem1875
protophloem1884
protoxylem1887
internal phloem1891
metaxylem1894
hadrome1898
leptome1898
metaphloem1900
included phloem1910
1898 H. C. Porter tr. E. Strasburger et al. Text-bk. Bot. 102 The vascular portion is also termed the xylem or hadrome, and the sieve-tube portion the phloem or leptome.
1902 Encycl. Brit. XXV. 409/1 The tissue developed to meet the demands for conduction..is known as leptom.
1914 M. Drummond tr. G. Haberlandt Physiol. Plant Anat. vii. 347 The protein-conducting elements..form..the delicate leptome portion..of the strand... If the leptome has no fibrous sheath, it of course becomes synonymous with phloem.
1914 M. Drummond tr. G. Haberlandt Physiol. Plant Anat. vii. 349 If the hadrome is central and the leptome peripheral, the bundle may be termed hadrocentric... The opposite or leptocentric..condition is exemplified by the leaf-trace bundles in many monocotyledonous rhizomes.
1965 K. Esau Plant Anat. (ed. 2) xii. 272 The term leptom deserves special mention. It refers..to the soft-walled conducting part of the phloem.
Derivatives
leptoˈcentric adj. having the leptome surrounded by hadrome.
ΘΚΠ
the world > plants > part of plant > cell or aggregate tissue > [adjective] > of xylem or phloem
reticulated1832
reticulate1842
concentric1878
interxylary1889
mesarch1891
hadrocentric1900
leptocentric1940
xylary1953
1940 Chambers's Techn. Dict. 495/2 Leptocentric vascular bundle, a concentric vascular bundle, in which a central strand of phloem is surrounded by xylem.
This entry has not yet been fully updated (first published 1976; most recently modified version published online December 2020).
<
n.1898