SPERMATOPHYTES: ANGIOSPERMS 375 
velops the pollen-tube, which penetrates the style to reach 
the ovary cavity which contains the ovules (megasporangia). 
The impossibility of contact between pollen and ovule im- 
plies inclosed ovules and hence seeds, and therefore the 
name " Angiosperm." 
(2) The female gametophyte is but slightly developed 
before fertilization, the egg appearing very early. 
(3) The female gametophyte produces no archegonia, 
but a single naked egg. 
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