580 PARASITISM OP NOTOTHIXOS INCANUS VAR. SUBAUREUS. 



10. Sieve-tubes are not present in the haustorimn, but laticiferous-like tissues 

 are developed. These are related to the tracheids of the haustorium. 



11. The haustorium is morphologically a part of the primary root of the 

 embryo specialised for absorption from the tissues of a host. 



12. The leaves are characteristically xerophytic, and the xerophily is consistent 

 with parasitism upon the water tissues of the hosts. 



I desire to record mj^ sincere thanks to Professor Lawson for his helpful 

 suggestions. 



Literature. 



Benson, M., 1910. — Root parasitism in Exoearpus (with comparative notes on 

 the haustoria of Thesium). Ann. Bot., xxiv., 667-677. 



Pierce, G. J., 1893. — On the structure of the haustoria of some Phanerogamic 

 Parasites. Ann. Bot., vii. 



. , 1905. — Dissemination and germination in Arceiithobium oceidentale. 



Ann. Bot., xix., 99-113. 



