10 PLANT PROPAGATION 



other way peculiar to the individual species of plant. 

 The stigma being moist, sticky or hairy when receptive, 

 holds the pollen grains until they germinate. In ger- 

 mination they extend growths downward through the 

 style to the ovary, where they reach the ovules, which 

 they enter through small openings called micropyles 

 (one in each ovule). After entrance, the sperm cell con- 

 tained in the pollen grain unites with the egg cell of the 

 ovule, and the ovule, now said to be fertilized, develops 

 into an embryo plant covered with the ovule wall, which 

 develops into the seed coat of the ripened seed. 





FIG. 7 LATH HOUSE FOR SUMMER PROPAGATION 

 This provides partial shade and helps retain moisture in the soil. 



23. The ripened ovary with its seed is called the peri- 

 carp or seed case. It may be simple, as in pea and radish, 

 or complex, as in plum and raspberry. Botanically speak- 

 ing, the ripened ovary with, in some cases, other parts 

 united to it, is called the fruit. Horticulturally speaking, 

 a fruit is an edible pericarp. In some instances the edible 

 part is the seed case (peach, cantaloupe) ; in others, the 

 seed itself (corn, almond) ; again, it is mainly the swelled 

 flower calyx (apple, pear) ; and yet again the swelled 

 receptacle with the seeds (strawberry, blackberry). 



24. Seeds contain plant food in the cotyledons or other 

 parts to support the seedling plants during germination 

 and until they are able to support themselves. Not until 



