Meristematic 



OF BOTANICAL TERMS. 



Metaphases 



M£RlSTEMAT IC, consisting of 

 meristem. 



MER'ITHAlL, see Internode. 



MERHhAL LtTS (obs.), see In- 

 ternode. 



MEROBLAs Tie, applied to the 

 formation of the embryo from 

 a part only of the oosphere, as 

 in some Gymnosperms. 



MES'OBLAST (obs.), see Nu- 

 cleus. 



MES'OCARP, the middle lawyer of 

 a pericarp when distinguish- 

 able into three layers. This 

 layer is sometimes developed 

 as a sarcocarp. Applied main- 

 ly to stone-fruits. 



M£S'0€HIL, the central part of 

 the labellum in such orchids as 

 have that organ separated into 

 three distinct portions. 



MESOPHLCE'UM, the middle or 

 green layer of the bark, be- 

 tween the liber and the outer 

 (usually dry) epiphlceum or 

 corky layer; cellular-envelope. 



MfiS'OPHYLL, all the fundamen- 

 tal tissue of a leaf within the 

 epidermis. 



MESOPHYL'LTJM, see Meso- 



PIIYLL. 



MEStiPH'YTtJM (obs.), see Col- 

 lar. Also applied by Lind- 

 ley to the line of demarcation 

 between internode and petiole. 



MflS'OSPERM, see Secundine. 



MES'OSPORE, the middle coat of 

 a spore when there are three. 



MESOSTY'LOUS, having styles of 

 intermediate length in hetero- 

 styled plants. 



MflSOTHE'CiUM, the central of 

 the three layers of cells in the 

 coat of an immature anther; 

 fibrous layer. The cells of 

 this layer have annular thick- 

 enings. In the mature anther 

 the proper endothecium has 



often disappeared, leaving the 

 mesolhecium as the inner lay- 

 er, which is then usually called 

 endothecium. 



MfiS'TOME, a term applied by 

 Schwendener to fibrovascular 

 tissue on functional grounds, 

 in distinction from cortical tis- 

 sue, which (serving for sup- 

 port chiefly) he termed stere- 

 ome. Strictly, however, the 

 term mestome refers only to 

 the essential or conductive por- 

 tion of a bundle, the bundle- 

 sheath being strengthening tis- 

 sue and therefore stereome. 



METAB'OLl§M, the chemical 

 changes which take place in 

 a plant in the process of 

 growth; metastasis; transmu- 

 tation. It includes both Ana- 

 bolism and Catabolism. 



MfiTAtrflN'ESiS, the production 

 of sexual individuals by non- 

 sexual means, either directly 

 or through intervening sexless 

 generations; alternation of 

 generations; polymorphism. 



METAKINE'SIs, that part of the 

 metaphases in karyokinesis 

 which includes only the sep- 

 aration of the threads. 



MSlT'AMER, applied by Sachs to 

 a Phyton (which see), or one 

 of any number of similar parts 

 connected in a series. 



MEtAmCr'PHOSIs, the varied 

 development of members of 

 the same morphological value, 

 resulting from their adapta- 

 tion to different functions. 

 Compare Transformation. 



MET'APHA§£S, a term applied 

 by Strasburger to those por- 

 tions of karyokinesis which 

 include the longitudinal split- 

 ting of the threads, the for- 

 mation of the mother-star, and 

 the subsequent separation of 



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