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A TEXTBOOK OF THEORETICAL BOTANY 



Fig. 1354. — Hieracium flagellare. Apospory. A, Megaspore tetrad and 

 aposporous cell of integument beginning to enlarge. B, Normal 

 embryo sac mother cell in process of division and aposporous embryo 

 sac mother cell enlarging. C, Normal embryo sac degenerated 

 (black) and aposporic sac (on left) nearly mature. {After Rosenberg.) 



