518 GLOSSARY 



Lodicule, minute scales at the base of the flower in the grasses which 



represent a rudimentary perianth, 162, 163. 

 Macrosporangium (Ma-cro-spor-an'-gium, plural, Macros porangia), the 



large sporangium of t heterosporous plants, 378, 391, 411. 

 Macrospore (Ma'-cro-spore), a large spore which develops the female 



prothallium of heterosporous plants, 378, 379, 386, 391, 409, 419. 

 Macrosporophyll (Ma-cro-spor'-o-phyll), the large spore bearing leaf of 



heterosporous plants, 397, 402, 409, 411. 

 Medulla (Me-dul'-la), pith, 62. 

 Medullary rays (Med'-ul-la-ry), pith rays, the parenchyma tissue extending 



from the pith of stems, between the bundles to the cortex, 62, 63. 

 Megasporangium (Meg-a-spor-an'-gi-um) = Macrosporangium, 378. 

 Megaspore (Meg'-a-spore) = Macrospore, 378. 

 Megasporophyll (Meg-a-spor'-o-phyll) = Macrosporophyll. 

 Meristem, (Mer'-i-stem), a group of growing cells at the end of stems and 



roots, 37, 61; also occurs at other growing areas, see Cambium. 

 Mesophyll (Mes'-o-phyll), the loose or spongy parenchyma in leaves, 91 



92, 94. 

 Mesophytes (Mes'-o-phytes), plants growing under moderate climatic and 



soil conditions, intermediate between desert and water plants, 456, 460. 

 Mesophytic (Mes-o-phyt'-ic), having the character of a mesophyte, 456. 

 Metabolism (Met-ab'-o-lism), chemical change, 113, 114. 

 Micropylar (Mi-crop'-y-lar), pertaining to the micro pyle or to the end 



of the embryo sac next the micropyle. 

 Micropyle (Mi'-cro-pyle), the opening between the seed coats, or in teg 



ments at the apex of the ovule, 6, 187, 200, 201, 391, 393, 400, 411, 



414, 416. 



Microsporangium (Micr-o-spor-an'-gi-um), the small sporangium of hetero- 

 sporous plants, 378, 390, 391, 398. 

 Microspore (Mi'-cro-spore), a small spore of heterosporous plants which 



develops the male prothallium, 378, 379, 390, 391, 399, 409, 419. 

 Microsporophyll (Mi-cro-spor'-o-phyll), the small spore-bearing leaf of 



heterosporous plants, 390, 402, 409. 



Monadelphous (Mon-a-del'-phous) , stamens all united in one group, 147. 

 Monocotyledons (Mon-o-cot-y-le'-dons), plants with i seed leaf, 57-62, 



172-181, 422-432. 

 Monoecious (Mon-oe'-cious), having staminate and pistillate flowers 



separate but on the same individual plant 145, 172, 178. 

 Morphology (Mor-phol'-o-gy), the study of the form of plants or of plant 



parts, 224, 231-421. 

 Mother cell, term applied to certain cells which give rise to other cells, but 



more particularly to a cell which gives rise to four spores following the 



division of its nucleus into four nuclei, 350, 390, 409. 



