35^ GLOSSARY OF TERMS USED IN THIS BOOK. 



Ligula. the strap-shaped corolla of the flower of certain composites, 278. 



Loculicidal, said of capsules which split down the middle line when ripe, 230. 



Lodicule, a reduced member of the perianth in grasses, 247, 248. 



Macrosporangium. a sporangium which contains the large spores, macro- 

 spores, or megaspores, 198, 201. 



Macrospores, the large spores which develop only female prothallia, found in 

 certain pteridophytes, in the gymnosperms, and possibly in the angio' 

 sperms, 182, 188. 



Mesocarp, an intermediate zone of the pericarp, when it is present, 230. 



Micropyle, the opening in the free end of the ovule, 209, 210. 



Microsomes, term used for the small granules in protoplasm, 25. 



Microspores, the small spores in the sporangium in those plants where the 

 spores are differentiated in size as in certain pteridophytes, in the gym- 

 nosperms and angiosperms (in the two latter the pollen grains are the 

 microspores), 182, 201. 



Monochasium, a kind of branching where one lateral branch is produced 

 from each relative or false axis, 228. 



Monopodial, said of the branching of shoots when the main shoot grows 

 more rapidly than the lateral shoots, 227. 



Mycelium, the vegetative part of most fungi, 25, 84-89, 125, 131, 134. 



Nucellus, the central part of the ovule, 208, 210, 212. 



Nucleus, a special organ in protoplasm, of a more dense structure than the 

 remainder of the protoplasm, 21. 



Nut, an indehiscent fruit with a dry hard pericarp, 230. 



Oogonium, the female sexual organ of certain low algse, as vaucheria, and 

 of certain fungi ; contains the egg, 122, 123. 



Orthotropous, a straight ovule, 206. 



Ovule, the macrosporangium of the gymnosperms and angiosperms, 191 ; oc- 

 curs usually within or upon the carpel, and at maturity contains the 

 embryo, if that is formed, 191, 198, 201, 205, 206, 207, 210. 



Panicle, a raceme with the lateral axes branched, 227. 



Pericarp, the part of the fruit which envelops the seed and which forms the 

 wall of the seed, 229, 230. 



Perigynous, said of flowers where the stamens or petals are borne on the 

 calyx, 222, 223, 265, 266. 



Perisperm, the remnant of the nucellus within the seed, when it is not en- 

 tirely consumed in the formation of the seed, 208, 210, 212. 



Perithecium, the closed or nearly closed fruit body of certain ascomycetous 

 fungi, 136-138. 



Phyllotaxy, term used to denote arrangement of leaves on the axis, 1 1. 



Pistil, the member of the flower which contains the ovules, 197, 198, 203, 

 206. 



