King.— Cytology of Araiospora. 
PLATE 13. 
Fig. 17. Longitudinal section of young antheridium showing nuclei and 
cytoplasm. 
Fig. 18a. Young oospore in which the fine meshed center is still well formed. 
Two nuclei are present, the fertilization tube is open, and the 
antheridium almost empty. Clusters of small nuclei appear in 
the peripheral cells. 
Fig. 18b. A composite drawing of figure 18a and the succeeding section 
which shows only the nuclear beaks. 
Fig. 19. Slightly older oospore in which the central ooplasm is radiating out 
to the periphery. The fertilization tube is filled with the 
cytoplasm which extends some distance in toward the male 
nucleus. The female nucleus appears in the next section. 
Fig. 20. The two sexual nuclei have put out beaks that appear in contact. 
Fertilization tube and almost empty antheridium show at lower 
right. The periplasmic walls are well developed at this stage. 
Fig. 21. Another illustration of pointing sexual nuclei. The central ooplasm 
is spreading out to the periphery. 
Fig. 22. Other instances of pointing sexual nuclei. As the nuclei approach, 
the cytoplasm usually becomes more compact between their 
beaks, suggesting that the cytoplasm offers considerable resistance. 
