GLOSSARY 331 



Epigyxous : applied to a flower whose outer parts appear to arise from 



the top of the ovary. 225. 

 Ecsporaxgiate : applied to those Pteridophytes and Spermatophytes 



whose sporangia develop from a group of epidermal and deeper 



cells. 157. 



Family : a group of related plants, usually comprising several genera. 



236. 

 Fertilization : the union of sperm and egg. 16. 

 Filament : the stalk-like part of a stamen. 197. 

 Fission: cell - division which includes the wall of the old cell. 



10. 

 Foot : in Bryophytes the part of the sporogonium imbedded in the 



gametophore : in Pteridophytes an organ of the sporophyte embryo 



to absorb from the gametophyte. 98, 138. 



Gametangrm : the organ within which gametes are produced. 11. 



Gamete : a sexual cell, which by union with another produces a sexual 

 spore. 10. 



Gametophore : a special branch which bears sex organs. 98. 



Gametophyte : in alternation of generations, the generation which bears 

 the sex organs. 97. 



Generative tell : in Spermatophytes the cell of the male gameto- 

 phyte (within the pollen grain) which gives rise to the male 

 cells. l-<>. 



Gents : a group of very closely related plants, usually comprising sev- 

 eral species. 237. 



Haustorrm : a special organ of a parasite (usually a fungus) for ab- 

 sorption. 50. 



IIeterogamocs : applied to plants whose pairing gametes are un- 

 like. 15. 



Heterosporous : applied to those higher plants whose sporophyte pro- 

 duces two forms of asexual spores. 151. 



Homosporous : applied to those plants whose sporophyte produces simi- 

 lar asexual spores. 151. 



Host : a plant or animal attacked by a parasite. 48. 



Hypha : an individual filament of a mycelium. 49. 



Hypocotyl : the axis of the embryo sporophyte between the root-tip and 

 ine cotyledons. 209. 



Hypogyxous : applied to a flower whose outer parts arise from beneath 

 the ovary. 224. 



