330 GLOSSARY 



Calyx : the outer set of floral leaves. 221. 



Capsule : in Bryophytes the spore- vessel ; in Angiosperms a dry fruit 



which opens to discharge its seeds. 98, 211. 

 Carpel : the megasporophyll of Spermatophytes. 178. 

 Chlorophyll : the green coloring matter of plants. 5. 

 Chloroplast: the protoplasmic body within the cell which is stained 



green by chlorophyll. 7. 

 Columella : in Bryophytes the sterile tissue of the sporogonium which 



is surrounded by the sporogenous tissue. 106. 

 Conidium : an asexual spore formed by cutting off the tip of the sporo- 



phore, or by the division of hyphae. 58. 

 Conjugation : the union of similar gametes. 15. 

 Corolla : the inner set of floral leaves. 221. 



Cotyledon : the first leaf developed by an embryo sporophyte. 138. 

 Cyclic : applied to an arrangement of leaves or floral parts in which 



two or more appear upon the axis at the same level, forming a cycle, 



or whorl, or verticil. 159. 



Dehiscence : the opening of an organ to discharge its contents, as in 

 sporangia, pollen-sacs, capsules, etc. 199. 



Dichotomous : applied to a style of branching in which the tip of the 

 axis forks. 35. 



Dicecious : applied to plants in which the two sex-organs are upon dif- 

 ferent individuals. 115. 



Dorsiventral : applied to a body whose two surfaces are differently 

 exposed, as an ordinary thallus or leaf. 109. 



Egg : the female gamete. 16. 



Egg-apparatus : in Angiosperms the group of three cells in the embryo- 

 sac composed of the egg and the two synergids. 204. 

 Elater : in Liverworts a spore-mother-cell peculiarly modified to aid 



in scattering the spores. 103. 

 Embryo : a plant in the earliest stages of its development from the 



spore. 137. 

 Embryo-sac : the megaspore of Spermatophytes, which later contains 



the embryo. 178. 

 Endosperm : the nourishing tissue developed within the embryo-sac, and 



thought to represent the female gametophyte. 180. 

 Endosperm nucleus : the nucleus of the embryo-sac which gives rise to 



the endosperm. 205. 

 Entomophilous : applied to flowers or plants which use insects as agents 



of pollination. 196. 



