1424 



A TEXTBOOK OF THEORETICAL BOTANY 







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Fig. 1 3 14. — Antipodal haustoria. A, Aster novae-angliae. Five 

 multinucleate antipodals of which the lowest forms a haus- 

 torium in the chalazal tissue. (After Chamberlain.) B, Sherardia 

 arvensis. Unicellular haustorium. {After Lloyd.) 



case of TrapeUa sinensis, described by Oliver, where the lowest megaspore 

 divides longitudinally and forms a long haustorium below the embryo 

 sac (Fig. 1315). 



