mesophytic 



Metaphei 4 ? 



COLLAR or junction of stem and 

 root ; (2) by Lindley given as the 

 demarcation between the internode 

 and petiole ; mesophyt'ic, relating 

 to plants which require an average 

 amount of moisture only ; Mesopo- 

 d'ium (TTOUS, irodbs, a foot), the inter- 

 mediate part of a leaf, the petiole 

 or leaf -stalk ; Mes'osperm (<rirepfji.a, 

 seed), the second membrane or 

 middle coat of a seed, thesarcoderm; 

 Mes'ospore (cr7ro/>A, seed) ; Dietel's 

 term for an Uredo-apore which ap- 

 parently will only germinate after 

 a resting period ; mesosty'lous 

 ( + STYLUS), in trimorphic plants 

 those which possess flowers hav- 

 ing styles of intermediate length ; 

 Mesothe'cium (#1^77, a case), (1) the 

 intermediate layer of cells in the 

 wall of the anther ; in ripe anthers it 

 often occurs as the inner layer by 

 disappearance of the endothecium 

 proper ; (2) the THECIUM of Lichens ; 

 Mes'otherm (Qtpw, heat), a plant of 

 the sub-tropical or warm temperate 

 zones, in Britain needing protec- 

 tion against frost ; mesotri'arch 

 ( + TRIARCH), when in a triarch stele 

 the two principal xylem bundles 

 are more or less fused (Prantl) ; 

 mesoxyl'ic (tfX<w, wood), a synonym 



Of MESARCH. 



Mes'tom or Mes'tome (/xe<rr6s, replete), 

 Schwendener's term for the ducts of 

 a bundle, those parts which do 

 not conduce to its strength ; cf. 

 STEREOME. 



Metar'abin (^erd, with, beyond, 

 sharing with, + Arabin), a sub- 

 stance present in some varieties 

 of gum arabic, possibly identical 

 with the " Pectose " of sugar beet ; 

 Metabio'sis (pios, life), symbiosis, 

 with one of the organisms pre- 

 paring the way for the other ; not 

 synchronous ; Met'ablast (^Xooros, 

 a bud), the NUCELLUS. 



metabolic (/ierajSoXTj, change), applied 

 to chemical changes in living organ- 

 isms ; ~ Force, vital activity ; Meta- 

 b'olism, the sum of the chemical 

 changes in a living cell, usually 



restricted to constructive change ; 

 cf. ANABOLISM, KATABOLISM ; meta- 

 b'olize, to change as described. 



Metacel'lulose (/j-era, with, + CELLU- 

 LOSE), found in Lichens and Fungi ; 

 it is the same as FUNGINE ; Meta- 

 chlamyd'eae (xXa/*i>s, a cloak), Mac- 

 millan's proposed term for Composi 

 tae ; adj. metachlamyd'eous ; Meta- 

 collench'yma ( + COLLENCHYMA), a 

 result of secondary metamorphosis 

 which has taken place at a late 

 period (C. Mueller) ; Metacra'sis 

 (Kpa<ris, a mixture), kinetic meta- 

 bolism, transmutation of energy ; 

 metad'romous (fy>6/*os, a course), 

 a form of venation in which in 

 a single Fern -frond the first set of 

 nerves in the segments are given 

 off on the upper, or the lower (basal) 

 side of the midrib (Prantl) ; meta- 

 gam'etal (+ GAMETE) Rejuven- 

 es'cence, a cell or mass of cells 

 acting as a gamete or zygote 

 (Hartog) ; Metagam'ophyte (ydfios, 

 marriage, (frvrbv, a plant), Mac- 

 ro illan's proposed name for his 

 highest group of Phanerogams, 

 a synonym of " Siphonogamia " ; 

 Metagen'esis (yei>c<ris, a beginning), 

 M'Nab's term for true alterna- 

 tion of generations ; Metakine'sis 

 (Kivrjo-is, a moving), the separation 

 of the threads in the metaphasis 

 stage of nuclear division ; Met'amer 

 (/tepos, a part), used by Sachs to 

 denote a PHYTON, or one of a 

 number of similar parts of a series. 



Metamorph'osis (/Aera/^/o^aws, trans- 

 formation), in botany the change of 

 one organ into another, as stamens 

 into petals ; syn. Metamor'phy ; 

 adj. metamor'phpsed, changed. 



Metane'ma (^erd, with, VT^^O.^ thread), 

 Macmillan's name for the second 

 stage in the germination of Mosses 

 which succeeds the protonema ; 

 adj.inetane'mal; Metaph'asis (0dris, 

 a phase), in nuclear division the 

 separation of the daughter chromo- 

 somes ; Metaph'ery (^ope'w, I carry), 

 the displacement of organs, as when 

 alternate become opposite, etc. ; 



157 



