GLOSSARY 385 



Host : a plant or animal attacked by a parasite. 



Hypha: an individual filament of a mycelium. 



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



and the cotyledons. 

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



the ovary. 



Inflorescence : a flower-cluster. 



Integument : in Spermatophytes a membrane investing the nucellus. 



Isogamous : applied to plants whose pairing gametes are similar. 



Male cell: in Spermatophytes the fertilizing cell conducted by the 



pollen-tube to the egg. 

 Megasporangium : a sporangium which produces only megaspores. 

 Megaspore : in heterosporous plants the large spore which produces a 



female gametophyte. 

 Meqasporophyll : a sporophyll which produces only megasporangia. 

 Mesophyll : the tissue of a leaf between the two epidermal layers which 



usually contains chloroplasts. 

 Microsporangium : a sporangium which produces only microspores. 

 Microspore : in heterosporous plants the small spore which produces a 



male gametophyte. 

 Microsporophyll : a sporophyll which produces only microsporangia. 

 Micropyle : the passageway to the nucellus left by the integument. 

 Monoecious : applied to plants in which the two sex organs are upon 



the same individual. 

 Mycelium : the mat of filaments which composes the working body of 



a fungus. 



Naked flower : one with no floral leaves. 

 Nucellus : the main body of the ovule. 



Oogonium: the female, egg-producing organ of Thallophytes. 



Oosphere: the female gamete, or egg. 



Oospore : the sexual spore resulting from fertilization. 



Ovary : in Angiosperms the bulbous part of the pistil, which contains 



the ovules. 

 Ovule : the megasporangium of Spermatophytes. 



Parasite : a plant which obtains food by attacking living plants or 



animals. 

 Perianth : the set of floral leaves when not differentiated into calyx 



and corolla. 



