100 THE SECOND BOOK OF BOTANY. 



EXERCISE XXXV. 

 Kinds of Ovule. 



FIG. 208. FIG. 209. 



Micropyle. 



Straight, or Orthotropous. Curved, or Campy lotropous. 



The STRAIGHT, or ORTHOTROPOUS OVULE, has the 

 base of the nucleus and the base of the ovule in the 

 same position, while the micropyle is at the apex 

 (Fig. 208). 



In the CURVED, or CAMPYLOTROPOUS OVULE, the 

 micropyle, or apex, is bent over close to the base 

 (Fig. 209). 



FIG. 210. FIG. 211. 



Rhaphe.-- f m jf J|_ Micropyle . 



Chalaza \1K__._ Micropyle . / ^ Jf ~" - Chalaza. 



Ehaphe.'' 

 Inverted, or Anatropous. Half-inverted, or Amphitropous. 



In the INVERTED, or ANATROPOUS OVULE, the fu- 

 niculus lengthens, and bends round, growing fast to 

 the coat, until the base of the nucleus is at the apex 

 of the ovule (Fig. 210). 



In the HALF-INVERTED, or AMPHITROPOUS OVULE, 

 the funiculus only lengthens till the ovule turns a 

 quarter of the way over, as in Fig. 211. 



