1460 



A TEXTBOOK OF THEORETICAL BOTANY 



an irregular pouch or caecum (Fig. 1340), penetrating and destroying the 

 chalazal tissue. The Scrophulariaceae usually develop haustoria at both 



Fig. 1338. — Veronica chamae- 

 drys. Micropylar hausto- 

 rium formed of a pair of 

 endosperm cells with the 

 suspensor between them. 

 (After Gscheidle.) 



Fig. 1339. — Leptosiphon androsace. 

 Basal haustorium invading 

 chalazal tissue. (After Billings.) 



Fig. 1340. — Grerillea robiista. A, Vermi- 

 form caecum formed from lowest endo- 

 sperm cell which remains undi\ided 

 but becomes multinucleate. B, Lower 

 end of caecum showing the three anti- 

 podals. (After Kaiisik.) 



