Medullary Sheath 



A DICTIONARY 



Meristem 



MED'ULLARY SHEATH, the ring 

 of primary xylem bundles 

 which project into the pith. 

 Compare Cobtical Sheath. 



MED'ULLARY SYS'TEM, a term 

 sometimes applied to the whole 

 fundamental S3 r stem, but usu- 

 ally, and more properly, em- 

 ployed to include only the pith 

 and medullary rays, or funda- 

 mental tissue within the cortex. 



MED'ULLOSE, pith-like. 



MEGALOGONIdIUM, see Macbo- 



8POBE. 



MEGARHY'ZOUS, large-rooted. 

 MEGASPORAN'GiUM, see Mac- 



BOSPOBANGIUM. 



MEG'ASPORE, see Macbospobe. 



MEI'OPHYLLY, the suppression 

 of one or more leaves or foliar 

 organs in a whorl; miophylly. 

 It differs from Abortion in the 

 fact that the suppressed organs 

 have never started to grow. 



MEIOSTflM'ONOUS, having fewer 

 stamens than petals. This is 

 its usual meaning. Compare 

 Isostemonous. 



MEI'OtAXY, the complete sup- 

 pression of a whole set of or- 

 gans, as all of the corolla or 

 all of the stamens. 



MELAnOSPERM'OUS, having 

 dark-colored seeds or spores. 



MELLIFEROUS, honey-bearing. 



MEL'ON-SHAPED, oval, with de- 

 pressed lines running from end 

 to end, as in most muskmelons. 



MELT'lNG, easily dissolving in 

 the mouth, or under slight 

 pressure. A descriptive char- 

 acter in certain varieties of 

 pears. 



MEM'BER, a term employed to 

 designate any part of a plant 

 when treated with reference to 

 its position and fundamental 

 structure, but not with refer- 



ence to function. Thus, all 

 leaves are one and the same 

 member, though they may be 

 developed in different ways to 

 form different organs. Com- 

 pare Organ. 

 MEMBRANACEOUS, see Mem- 



BBANOUS. 



MEM'BRANE, a very thin ex- 

 panded tissue, serving the 

 purpose of separation or pro- 

 tection. 



MEMBRANEOUS, see Membra- 

 nous. 



MEM'BRANOUS, thin, soft, and 

 usually translucent, like a 

 membrane. Compare Sca- 



BIOU8. 



MENlS'COID, shaped like a me- 

 niscus or concavo-convex lens. 



MfiN'TUM, a forward projection 

 of the foot of the column in 

 some orchids. 



MER'ICARP, one of the carpids 

 or ripened carpels of a schizo- 

 carp, especially one of the 

 halves of the cremocarp in 

 Umbelliferae; diachamium; 

 hemicarp. 



MER'IDISK, a name proposed by 

 Clos for any process upon the 

 receptacle, aside from the floral 

 organs, whether glandular or 

 not. See Lepal. 



mErIsmAT'IC, dividing into 

 parts by the formation of 

 septa. 



MER'ISPORE, one of the cells of 

 a compound spore. 



MERISTEM, tissue in an early 

 condition or nascent state while 

 the cells are still undergoing 

 cell-division, as in cambium; 

 formative tissue; generating 

 tissue. 



MER'lSTEM, PRIMARY, see 

 Pbimaby Mebistem. 



MER'iSTEM, SECONDARY, see 

 Secondaby Mebistem. 



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